HP 44702B Channel input card

The SPC includes protection and alarm indication for the following faults: 

 DeviceNet Comm Time-out  Analog Input Out-of-Range 

 Feedback Open-Wire 

 Feedback Voltage Out-of-Range  Position Error  Internal SPC Faults 

 Actuator Open/Short 

 Driver Overcurrent A hard-wired shutdown contact input and relay driver output are provided to allow for interfacing with external protection circuits.

Redundancy 

Optionally the SPC can be configured to accept redundant position commands and redundant servo position feedback signals. The SPC has the capability to accept DeviceNet and 4–20 mA based position demand signals and upon the failure of either demand signal to switch to the healthy input demand signal. The SPC also has the capability to accept two servo position feedback signals and switch to the healthy feedback signal when one of the feedback signals fails.

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