Data plc labview

First off thank you for anyone that reads this, I am very new at LabVIEW, and I think this maybe a trival question but I am not sure.
I am building a test bench to measure the torque vs angle of clutch disc to find the hystersis. I am confedient that my program is fine to record the data. I am usin a servo motor to apply the torque and when the torque gets to high I want the plc to shut off the servo motor. I want LabVIEW for the data acqusition but the plc for the control. I have no experience with modbus. I was wondering if i could share the output from the torque transducer with both the plc and LabVIEW or would this weaken my signal and affect my data? The torque transducer is a mv/v output, the tourque transducer is TRS-20K from transducer techniques. I will be using a PLC from automation direct, and a NI-9237.
http://www.transducertechniques.com/trs-torque-sensor.aspx
Thansk for your time
Solved!
Go to Solution.

Hello Carl,
It sounds like all you need to do is send an on/off signal to a PLC. Any communication (modbus, OPC, DataSocket, EPICS) that occurs between the host PC and a PLC is non-deterministic. These will all result in some form of varying delay.
The USB-DAQ will be able to output a signal from your computer to your PLC. If you program the PLC to record the signal from the DAQ to control your transducer, this should work. There will be a delay between when you send the output signal to the DAQ and the PLC reacts. This delay will not be deterministic. It will vary depending on your current operating system usage. With that being said you should be able to get a response within 100ms.
How fast are you looking to control this PLC? Do you need the control to have a deterministic/consistent delay? Are you doing closed loop control testing?
Hypothetically, if your computer crashed while the DAQ is in applying torque, you would still be applying torque until you reset the device. If you continually torque, will this damage any of your setup? If so, I would recommend implementing some kind of watch dog timer on the PLC which can be reset by the DAQ.
If you are looking for a deterministic solution, I would recommend using a cRIO with LabVIEW Real-time.
Regards,
Thomas C.
Applications Engineer
National Instruments

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