A.4 OPERATING DOs IN PARALLEL
Figure A-4 illustrates two DOs connected in parallel to a single power source (controller rear termi-
nal board 24V dc screw lug TB1-1 or TB1-4) so that any one of the two DOs can actuate the relay.
Figure A-4.. Operating DOs in Parallel
A.5 CASCADING A DO TO A DI
In Figure A-5, the DO of one controller is applied directly to the DI of another controller. When the
DO closes, the DI circuit of the second controller is complete. The voltage dropping resistor in the
second controller is required for its DI operation.
Figure A-5. Cascading a DO to a DI
Appendix A. Discrete Output DOs
A-3
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