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CTI 2572 Installation and Operation Guide
138
General Command Considerations
When designing your PLC logic you should be aware of the following:
• The Command Trigger is ignored for a command if the associated Abort Trigger is set.
• In Uncoupled Mode, the PLC may not see CMD B
USY go low in between command cycles. After
you lower the trigger, the module may execute the command additional times.
• If E
RR ACK is set and left high, the associated CMD ERR bit may be set and cleared without the
PLC detecting it.
• With the notable exception of Module Reset (all four abort triggers are set along with the module
reset bit) the command slots are totally independent. Unless the commands are directed to a
common resource, the command slots should have no effect on each other.