Rockwell Automation Publication 440R-UM014D-EN-P - December 2019
25
Chapter
6
Status Indicators and Diagnostics
Three indicators on the front provide the operating status of the MSR55P
describes the state of each indicator.
Table 6 - Status Indicators
MSR55P safety relays include a number of facilities to detect faults that could
influence the safety function of the module. Checks are conducted on power-
up of the unit and in cycles during normal operation. If a fault occurs, the
output relays switch off. The fault state is indicated with the ERR indicator, the
V
S
indicator, and the semiconductor output ERR.
With safety relevant failures, your MSR55P safety relay differentiates between
external failures (broken wire/offset, simultaneity failure, or feedback circuit
failure) and internal failures.
Broken wire/offset failures and feedback circuit failures can be restored by
using manual reset. They can also be reset automatically after removing the
fault by placing a jumper from terminal X2 to X3.
The number of times the ERR status indicator blinks communicates
diagnostics. When multiple faults exist simultaneously, the ERR indicator
shows the highest priority. After the highest priority fault is corrected, the
ERR shows the next highest priority fault.
shows the
codes in order of priority.
Indicator
State
Description
V
S
Off
No power to A1
Green
Normal operation
Red
Internal Fault
OUT
Green
Safety outputs are energized
Flashing green
In timing cycle
Flashing orange
Intermittent crossing of the V
m
trip point
Orange
Safety outputs are de-energized
Off
Code 1 or code 5 error is present
ERR
Off
No faults exist; normal operation
Flashing red
Fault is present. See
