Rockwell Automation Publication 440R-UM012E-EN-P - November 2018 51
Example Operational Sequence Diagrams Chapter 9
6. Then, the speed becomes faster than the safely limited speed set by SLS1
on the GLP safety relay. The GLP safety relay issues a lock command
and turns off its outputs (X14/X24/L11/Y32). The gate switch outputs
turn ON and energize K1 and K2. This speed is the normal machine
operating speed during production.
7. Later, you want to enter the cell. You press the Stop button and the
machine begins to decelerate.
8. When the speed of the machine decelerates below the safely limited
speed, the GLP safety relay begins its Frequency Measurement Timer to
help verify that the machine is consistently below the SLS1 setting.
9. The GLP safety relay turns its outputs (X14/X24/L11/Y32) ON and
starts the unlock delay time. The combination of the Logic and SLS2/
Time settings set the unlock delay time.
10. At the end of the unlock delay time, the GLP safety relay unlocks the
gate, which allows you into the cell. After completing the production
operations, you leave the cell and close the gate.
11. You press the Start button to begin production operations.
12. When the speed of the machine reaches the SLS1 setting, the GLP locks
the gate and turns its outputs OFF.
Status Only Example
This example only applies for Logic setting 8, when the configuration process
starts from 9. The GLP safety relay does not perform any guard locking or
resetting.
Example Schematic
Figure 44 shows the outputs that turn ON based on the speed the proximity
sensors detect. When the speed exceeds SLS1, the 51/61 outputs turn ON.
When the speed exceeds SLS2, the remaining outputs turn ON; that is, all
outputs are ON, when the speed exceeds SLS2.
Figure 44 - Schematic for Status Only
+24V DC
24V DC Com
Proximity Sensors
872C-D8NP18-D4
989D-F4AC-2
Speed Exceeds SLS1
OSSD Outputs
Speed Exceeds SLS2
Single Wire Safety Output
OSSD Outputs
Auxiliary Output
Brown
Black
Black
Blue
Blue
LOGIC SLS1
0
1
2
3
4
5
6
7
8
9
0
1
2
3
4
5
6
7
8
9
SLS2/TIME
0
1
2
3
4
5
6
7
8
9
GLP
440R-GL2S2P
A2 S12 S22
L11L12 L6151
P12 P22
A1 X14 X24
S44 S54AP
Y32
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