2020-03-31 08:40:08 +02:00
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# Strolch as a software PLC
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A soft real time PLC written in Strolch running on Strolch
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2020-03-30 22:43:14 +02:00
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Checkout the documentation at https://strolch.li/plc.html
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2020-03-31 08:40:08 +02:00
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## Features
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Strolch PLC supports the following features:
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* Notification model
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* Raspberry Pi GPIO Input and Output addresses
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* I2C Input and Output addresses over PCF8574 chips
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* DataLogic Scanner connection
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* Virtual addresses
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* WebUI to observer and manipulate the addresses
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* WebSocket connection to Strolch Agent for notifying of changes
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* Simple two key addressing of hardware addresses to store semantics, e.g. `Convey01 - MotorOn`, instead of `i2cInput.dev01.0.0`
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## PlcAddress
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PlcAddresses store the value of a hardware address:
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<Resource Id="A_Conveyor01-Occupied" Name="Conveyor01 - Occupied" Type="PlcAddress">
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<ParameterBag Id="parameters" Name="Parameters" Type="Parameters">
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<Parameter Id="description" Name="Description" Type="String" Index="5" Value="Conveyor 1"/>
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<Parameter Id="address" Name="HW Address" Type="String" Interpretation="PlcConnection" Index="10" Value="i2cInput.dev01.0.0"/>
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<Parameter Id="resource" Name="Resource ID for PlcAddress" Type="String" Index="20" Value="Conveyor01"/>
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<Parameter Id="action" Name="Action ID for PlcAddress" Type="String" Index="30" Value="Occupied"/>
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<Parameter Id="index" Name="Index" Type="Integer" Index="40" Value="10"/>
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<Parameter Id="value" Name="Value" Type="Boolean" Index="100" Value="false"/>
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</ParameterBag>
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</Resource>
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The two parameters `resource` and `action` are the local keys for the address,
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while `address` is used to find the actual connection and the address on that
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connection.
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## PlcTelegram
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PlcTelegrams are used to store keys with a default value. For example it is
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easier to understand `Conveyor01 - MotorOn` instead of `Conveyor01 - Motor` with the value true or false.
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<Resource Id="T_Conveyor01-MotorOn" Name="Conveyor01 - MotorOn" Type="PlcTelegram">
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<ParameterBag Id="parameters" Name="Parameters" Type="Parameters">
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<Parameter Id="description" Name="Description" Type="String" Index="5" Value="Conveyor 1"/>
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<Parameter Id="address" Name="HW Address" Type="String" Interpretation="PlcConnection" Index="10" Value="i2cOutput.dev01.0.0"/>
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<Parameter Id="resource" Name="Resource ID for PlcAddress" Type="String" Index="20" Value="Conveyor01"/>
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<Parameter Id="action" Name="Action ID for PlcAddress" Type="String" Index="30" Value="MotorOn"/>
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<Parameter Id="index" Name="Index" Type="Integer" Index="40" Value="10"/>
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<Parameter Id="value" Name="Value" Type="Boolean" Index="100" Value="true"/>
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</ParameterBag>
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</Resource>
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## PlcLogicalDevice
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Multiple PlcAddresses can be grouped together into a PlcLogicalDevice for
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visualization on the UI. In logistics a single conveyor might have multiple
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sensors and actors, e.g. the conveyor's motor, a light barrier and a scanner,
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grouping them together makes it easier for debugging.
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<Resource Id="D_MaterialFlow" Name="MaterialFlow" Type="PlcLogicalDevice">
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<ParameterBag Id="parameters" Name="Parameters" Type="Parameters">
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<Parameter Id="description" Name="Description" Type="String" Index="5" Value="Material Flow"/>
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<Parameter Id="group" Name="Group" Type="String" Index="20" Value="01 Material Flow"/>
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<Parameter Id="index" Name="Index" Type="Integer" Index="30" Value="10"/>
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</ParameterBag>
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<ParameterBag Id="relations" Name="Relations" Type="Relations">
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<Parameter Id="addresses" Name="Addresses" Type="StringList" Interpretation="Resource-Ref" Uom="PlcAddress" Index="10" Value="A_Conveyor01-Occupied, A_Conveyor02-Occupied, A_Conveyor03-Occupied, A_Conveyor04-Occupied, A_Conveyor01-MotorOn, A_Conveyor02-MotorOn, A_Conveyor03-MotorOn, A_Conveyor04-MotorOn, A_Conveyor03-Barcode, A_Conveyor03-On"/>
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<Parameter Id="telegrams" Name="Telegrams" Type="StringList" Interpretation="Resource-Ref" Uom="PlcTelegram" Index="20" Value="T_Conveyor01-MotorOn, T_Conveyor01-MotorOff, T_Conveyor02-MotorOn, T_Conveyor02-MotorOff, T_Conveyor03-MotorOn, T_Conveyor03-MotorOff, T_Conveyor04-MotorOn, T_Conveyor04-MotorOff, T_Conveyor03-On, T_Conveyor03-Off"/>
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</ParameterBag>
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</Resource>
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## PlcConnections
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PlcConnections are used to model the actual hardware connections and define with
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which class the connection is to be established. The following shows some of the implementations:
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<!--
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Raspberry GPIO BCM Address connection
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-->
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<Resource Id="raspiBcmGpioOutput" Name="Raspi BCM GPIO Output" Type="PlcConnection">
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<ParameterBag Id="parameters" Name="Parameters" Type="Parameters">
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<Parameter Id="className" Name="Connection Class" Type="String" Value="li.strolch.plc.core.hw.gpio.RaspiBcmGpioOutputConnection"/>
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<Parameter Id="state" Name="Connection State" Type="String" Interpretation="Enumeration" Uom="ConnectionState" Value="Disconnected"/>
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<Parameter Id="stateMsg" Name="Connection State Msg" Type="String" Interpretation="Enumeration" Uom="ConnectionState"
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Value=""/>
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<Parameter Id="inverted" Name="Inverted" Type="Boolean" Value="false"/>
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<Parameter Id="bcmOutputPins" Name="BCM Output Pins" Type="IntegerList" Value="27"/>
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</ParameterBag>
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</Resource>
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<Resource Id="raspiBcmGpioInput" Name="Raspi BCM GPIO Input" Type="PlcConnection">
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<ParameterBag Id="parameters" Name="Parameters" Type="Parameters">
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<Parameter Id="className" Name="Connection Class" Type="String" Value="li.strolch.plc.core.hw.gpio.RaspiBcmGpioInputConnection"/>
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<Parameter Id="state" Name="Connection State" Type="String" Interpretation="Enumeration" Uom="ConnectionState" Value="Disconnected"/>
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<Parameter Id="stateMsg" Name="Connection State Msg" Type="String" Interpretation="Enumeration" Uom="ConnectionState"
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Value=""/>
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<Parameter Id="inverted" Name="Inverted" Type="Boolean" Value="true"/>
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<Parameter Id="bcmInputPins" Name="BCM Input Pins" Type="IntegerList" Value="4"/>
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</ParameterBag>
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</Resource>
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<!--
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I2C input connections
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-->
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<Resource Id="i2cInput.dev01" Name="PCF8574 Input 0x38" Type="PlcConnection">
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<ParameterBag Id="parameters" Name="Parameters" Type="Parameters">
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<Parameter Id="className" Name="Connection Class" Type="String" Value="li.strolch.plc.core.hw.i2c.PCF8574InputConnection"/>
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<Parameter Id="state" Name="Connection State" Type="String" Interpretation="Enumeration" Uom="ConnectionState" Value="Disconnected"/>
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<Parameter Id="stateMsg" Name="Connection State Msg" Type="String" Interpretation="Enumeration" Uom="ConnectionState"
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Value=""/>
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<Parameter Id="i2cBus" Name="I2C Bus" Type="Integer" Value="1"/>
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<Parameter Id="addresses" Name="Addresses" Type="IntegerList" Value="0x38"/>
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<Parameter Id="verbose" Name="Verbose" Type="Boolean" Value="true"/>
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<Parameter Id="inverted" Name="Inverted" Type="Boolean" Value="true"/>
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<Parameter Id="interruptPinPullResistance" Name="Raspi Interrupt PinPullResistance" Type="String" Value="PULL_DOWN"/>
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<Parameter Id="interruptChangeState" Name="Raspi Interrupt Change State" Type="String" Value="HIGH"/>
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<Parameter Id="interruptBcmPinAddress" Name="Raspi BCM Interrupt Pin" Type="Integer" Value="17"/>
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</ParameterBag>
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</Resource>
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<!--
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I2C output connections
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-->
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<Resource Id="i2cOutput.dev01" Name="PCF8574 Output 0x21" Type="PlcConnection">
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<ParameterBag Id="parameters" Name="Parameters" Type="Parameters">
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<Parameter Id="className" Name="Connection Class" Type="String" Value="li.strolch.plc.core.hw.i2c.PCF8574OutputConnection"/>
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<Parameter Id="state" Name="Connection State" Type="String" Interpretation="Enumeration" Uom="ConnectionState" Value="Disconnected"/>
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<Parameter Id="stateMsg" Name="Connection State Msg" Type="String" Interpretation="Enumeration" Uom="ConnectionState"
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Value=""/>
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<Parameter Id="i2cBus" Name="I2C Bus" Type="Integer" Value="1"/>
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<Parameter Id="addresses" Name="Addresses" Type="IntegerList" Value="0x21"/>
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<Parameter Id="inverted" Name="Inverted" Type="Boolean" Value="false"/>
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</ParameterBag>
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</Resource>
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<!--
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Barcode reader connection, currently place holder with RandomString
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-->
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<Resource Id="dataLogicScanner" Name="DataLogic Scanner Connection" Type="PlcConnection">
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<ParameterBag Id="parameters" Name="Parameters" Type="Parameters">
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<Parameter Id="className" Name="Connection Class" Type="String" Value="li.strolch.plc.core.hw.connections.DataLogicScannerConnection"/>
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<Parameter Id="address" Name="Scanner IP Address" Type="String" Value="192.168.1.249:51236"/>
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<Parameter Id="readTimeout" Name="Read Timeout (s)" Type="Integer" Value="60"/>
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<Parameter Id="state" Name="Connection State" Type="String" Interpretation="Enumeration" Uom="ConnectionState" Value="Disconnected"/>
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<Parameter Id="stateMsg" Name="Connection State Msg" Type="String" Interpretation="Enumeration" Uom="ConnectionState"
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Value=""/>
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</ParameterBag>
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</Resource>
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## Virtual Addresses
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In some cases, especially in conjunction with a Strolch Agent as the main
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server, it is necessary to also have virtual addresses, with which to perform
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notifications. The following shows examples:
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<Resource Id="addrPlcConnected" Name="PLC - Connected" Type="PlcAddress">
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<ParameterBag Id="parameters" Name="Parameters" Type="Parameters">
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<Parameter Id="address" Name="HW Address" Type="String" Interpretation="PlcConnection" Value="virtualString.plcServerConnected"/>
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<Parameter Id="resource" Name="Resource ID for PlcAddress" Type="String" Value="PLC"/>
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<Parameter Id="action" Name="Action ID for PlcAddress" Type="String" Value="ServerConnected"/>
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<Parameter Id="valueType" Name="Value Type" Type="String" Interpretation="Interpretation" Uom="PlcValueType" Value="String"/>
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<Parameter Id="value" Name="Value" Type="String" Value="false"/>
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<Parameter Id="index" Name="Index" Type="Integer" Value="5"/>
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</ParameterBag>
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</Resource>
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2020-03-31 08:45:17 +02:00
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## More Information
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Find more to Strolch PLC at our website: https://strolch.li/plc.html
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