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slychiu
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OP04 is an Output Submodule with 4 Relays which plugs in to CM9001 in place of OP01 (with 8 open-collector Outputs).
This connects 4 relays direct to Outputs 1 to 4 of CM9001. Outputs 5 to 8 are not available when OP04 is plugged in





Swiss-Toni
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With the OPO1 if the board goes you would just replace the board, if this goes you have to replace the board or is that a resetable fuse set into it, also what what is the voltage max capacity.

slychiu
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If this fails you also replace the submodule just line OP03 and OP01

It is less likely to fail than OP03 or OP01 because the relays have 5000V isolation/breakdown volatge.
In OP01 and OP03 the outputs are open collector transistor outputs and are more easily damaged


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