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CR1000 VX excitation port sharing


weatherguy Jul 25, 2019 08:45 AM

I need to add a 4th sensor that requires excitation to a CR1000 but all 3 VX ports are already being used.  VX3 is a CS107 and I need to add another CS107.  Can both share VX3 without affecting the operation of either sensor (there would be 2 successive Therm107 calls, 1 to each sensor)?

Thanks!


smile Jul 25, 2019 10:12 AM

Hi

a VX channel can supply tens of 107 sensors, perhaps even more than those that the wires enter the terminal!

It is possible to use one instruction for each 107. If n 107 are on successive channels, even a single instruction, declaring n repetitions. Obviously without increasing the Vx channel, which is always the same.

Smile

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