How much current is needed by the pump control? Sounds like you are exceeding teh capability of the module, from the manual:
Current Limit Detection
Each channel on the [c]FP-AO-210 has a monitoring circuit that
detects the amount of current flowing into (sinking) or out of
(sourcing) the channel. If this value exceeds the maximum
allowable (1 mA with no external supply; 10 mA with external
supply), the circuit lights a red
STATUS indicator for each
affected channel, reports the error to the network module, and
adjusts the output voltage so that only the maximum allowed
current flows. The error is reported before the output is adjusted.
The indicator may start to light dimly as the limit is approached.
-AK2DM
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