Rockwell Automation Publication 1444-UM001D-EN-P - June 2018 311
Operate the Module Chapter 10
Tacho (TSC) Module
The first two status indicators reflect the two tacho channels and the second
two the output signal available on the channel BNC connectors.
Tacho Channels
If the tacho channel is enabled, the status indicator is green. The status
indicator flashes off when a pulse is detected. At low speed/event rates, the
repetitive flash off reflects actual detections. However, the rate of flashing is
limited to the MSP run flash rate. At higher speeds the flashing is simply an
indicator of events, and not necessarily the actual time of those events.
A normal expected state for a healthy channel is flashing green (machine
running). If a tacho sensor failure is detected, the blue rather than green status
indicator is active.
An internal power supply fault (out of specification ±25.5V supply) triggers
the red Status Indicator to be active. If both channels are enabled, both
similarly indicate that fault, but whether it affects tacho operation depends on
the module configuration (whether a transducer is used and which one).
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