Rockwell Automation Publication 440R-UM012E-EN-P - November 2018 39
Chapter 8
Proximity Sensors and Targets
Proximity Sensor Selection
The GLP safety relay accepts proximity sensors that meet the following
requirements:
1. 24V DC powered
2. 3-wire (Power, Ground, and Signal)
3. PNP Output Type
4. Leakage current less than 1 mA.
The GLP safety relay does not require the use of safety-rated proximity sensors.
Redundant standard-rated industrial sensors are sufficient to meet the safety
ratings of the GLP safety relay.
Proximity Sensor Targets
The sensors must be mounted no further than 0.8 times their nominal sensing
distance. To achieve maximum speed, the sensors must be mounted at 0.5 times
their nominal sensing distance. The depth of the gear space must be at least
three times the nominal sensing distance.
The proximity sensors have the following requirements:
1. The space must be at least twice the diameter of the proximity sensors.
2. The mark (target) must be at least four times the diameter of the
proximity sensor.
3. The detection of the targets must be alternating.
4. With logic settings 1…4, both sensors cannot be off simultaneously.
With logic settings 5…8, both sensors can be off simultaneously, but the
recommended arrangement is to mount the sensors so that both sensors
are not off simultaneously.
5. Due to the overspeed detection time, speed limits must be set lower than
the maximum allowable speed limit.
ATTENTION: To avoid a single common cause failure to danger, the
proximity sensors must be mounted on independent hardware brackets and
fixtures when logic settings 5…8 are used.
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