12 Rockwell Automation Publication 440R-UM012E-EN-P - November 2018
Chapter 1 Overview
Logic Setting 5…8 - Guard Locking with Delayed Unlock and
Automatic Reset
The GLP safety relay uses two timers to delay the turning ON of the safety
outputs and unlocking the gate.
When the proximity sensor speed falls below SLS1, the GLP safety relay starts
the Frequency Measurement timer. The timer duration is dependent on the
SLS1 setting. The GLP safety relay waits to verify that the proximity sensor
speed is maintained below SLS1. For slower SLS1 settings, the GLP safety relay
waits longer. For higher SLS1 settings, the GLP safety relay responds a little
faster.
If the proximity sensor speed is maintained below SLS1, the GLP safety relay
turns on the X14, X24, Y32, and L11 outputs. The GLP safety relay also starts
the unlock timer.
After the unlock timer expires, the GLP safety relay turns on the 51 and L61
outputs, which unlock the safety gate.
A combination of the Logic switch and SLS2 sets the duration of the unlock
timer. The Logic switch sets a range of delay and the SLS2 switch sets a
percentage of that range.
As the speed of the proximity sensors crosses (increasing or decreasing) the
SLS1 setting, the outputs and locking functions are performed automatically.
The frequency measurement and unlock timers only apply when the proximity
sensor speed decreases below the SLS1 setting.
The S12, S22, S44, and S54 inputs do not have any functionality and do not
need any connections.
Logic Setting 8 — Speed Status Only
This logic setting does not control a guard locking interlock. This setting
ignores the unlock, lock, L12 inputs, and also the safety inputs S12 and S22.
When the proximity sensors measure speed that is below SLS1, all outputs are
OFF. When the speed is greater than SLS1, but less than SLS2, the 51 and L61
terminals are high and the 51/L61 status indicator is ON. When the speed
exceeds SLS2, all outputs (51, L61, X14, X24, Y32, and L11) are high and the
51/L61 and X14/X24 L11 status indicators are ON. When the speed crosses
the SLS1 and SLS2 levels, the outputs turn ON and OFF automatically.
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