I am using Allan Bradley PLC with a servo module (1756-M02AE) for obtaining velocity and position. In this, I am using a position loop for controlling the velocity of the structure. I need a in detailed explanation regarding this position loop. In this regard, I am attaching the document of the servo module. Please refer to page number 132 in the document for the line diagram of the position loop.
I think I am able to help you for your question, but I do not need to read 132 pages of the AB PLC user manual. Basically, there are a few steps that should get done as follows:
1. Connect a position sensor correctly calibrated (ie. with a linear proportional gain) as an analogue input to the servo module. This input should act as your measured position data with a pair of wires, in which one is connected to +CHA for the positive signal and another one is the com point to be connected to –CHA.
2. Once you receive the position signal x into the PLC, you should be able to program for obtaining the corresponding velocity via a relationship v=dx/dt. Then, both the position and the velocity can be obtained easily. If you are not familiar with the use of AB PLC program, you should attend a training course to learn how to write PLC codes. Hope this helps. Good luck!
Dear Santosh,
i agree with Mr.Ning but in addition to the configuration of servo modules and getting the signals on + & - channels of the module you have to consider the P & I Velocity gains while considering the configuration of the servo modules because even though you if you are successful in getting the signals to channel untill unless you cnfigure the servo module you will not get the exact values.
these values you can observe in ladder logic and also in SCADA.
This seems a better answer from Mohammed Khan, but it is so funny to call me Mr Ning as I am actually a lady. You can call me Dr Ning which should be fine.
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