Rockwell Automation 440C Guardmaster 440C-CR30 Configurable Safety Relay User Manual - Manual (Page 67)

Rockwell Automation Publication 440C-UM001C-EN-P - November 2014 67
Safety Monitoring Functions Chapter 9
Figure 72 - Wiring Connection for a Type IIIC Two-hand Control with Test Pulses
The timing diagram for the two-hand control is shown in Figure 73 . The Type
IIIA uses only the N.O. contact of the button. The Type IIIC uses both the N.C.
and the N.O. contacts.
Figure 73 - Two-hand Control Timing Diagram
Description Description
1 Hand 1 button is pressed. 5 Hand 2 button is pressed.
2 Hand 2 button must be pressed within 500 ms
for the output logic to turn ON. 6 Hand 1 button must be pressed within 500 ms
for the output logic to turn ON.
3 Releasing either hand button causes the logic
output to turn off. 7 Releasing either hand button causes the logic
output to turn off.
4 Both hand buttons must be released to start a
new cycle. 8 Both hand buttons must be released to start a
new cycle.
+24V DC
24V Com
A B
05
CR30
02 01 00 03 04
A1 15 20 21 16
06
18 A2
07
19
08 10 11
12 13 14
09
17
Logic Output
Hand 1 N.C.
Hand 1 N.O.
Hand 2 N.C.
Hand 2 N.O.
HI
LO
HI
LO
HI
LO
HI
LO
HI
LO
1 4 3 2 5 6 7 8
must be less than 500ms