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Query a Dryer using SPI communition port

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Thread Starter

Howard

I want to query a Dryer using SPI communition port with a Siemens 200 in freeport mode. This is a RS485 port on the dryer. I am looking for a Function Block to handle the query and the reply. Has anyone already done the programming to querry for a dew point alarm or other alarm on the SPI communition port on a dryer with a Siemens 200 PLC in freeport mode?
 
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