novice
Member
This is partly related to PLC so here goes.
On the three panels to be tested, the AO channels are connected to KFD2-SCD2-Ex1. Problem is, the test unit at the other end of the barriers got nothing. After speaking with technical support of both P+F and Rockwell, it came down to the wiring on the AO card side. It is correct as per the P+F datasheet and 1769-OF8C installation manual. However, the card has the open wire bit set. Troubleshooting the wires reveal no open wire in themselves. But the impedance across the barrier inputs (#7 & #8) gave a impedance around 13.2 MOhms. So I disconnet from the barrier and wire direct to test unit. Got 4-20 mA perfect.
So the problem is the barrier. That for some reason don't work with this AO card. Anyone recommend an alternative P/N or brand in place of this? Thanks very much.
On the three panels to be tested, the AO channels are connected to KFD2-SCD2-Ex1. Problem is, the test unit at the other end of the barriers got nothing. After speaking with technical support of both P+F and Rockwell, it came down to the wiring on the AO card side. It is correct as per the P+F datasheet and 1769-OF8C installation manual. However, the card has the open wire bit set. Troubleshooting the wires reveal no open wire in themselves. But the impedance across the barrier inputs (#7 & #8) gave a impedance around 13.2 MOhms. So I disconnet from the barrier and wire direct to test unit. Got 4-20 mA perfect.
So the problem is the barrier. That for some reason don't work with this AO card. Anyone recommend an alternative P/N or brand in place of this? Thanks very much.