Safety Relay User Manual Owner's manual

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

CR30

020100 03 04

A1 15 20 2116

18A2

08 10 11

12 13 14

Logic Output

Hand 1 N.C.

Hand 1 N.O.

Hand 2 N.C.

Hand 2 N.O.

1 432 5 6 7 8

must be less than 500ms