Rockwell Automation Publication 440R-UM013E-EN-P - March 2017 69
Troubleshooting Chapter 11
1. Check the safety inputs with the device contacts open, as shown in
Figure 62
.
Figure 62 - Typical Voltage Measurements of the DI, DIS, and SI Relays with Contacts Open
2. Check the voltage at each of the inputs with the device contacts closed.
The values must be very close to the values measured at terminals S11
and S21.
Figure 63 - Typical Voltage Measurements of the DI, DIS, and SI Relays with Contacts Closed
3. If a significant difference in voltage levels exists, see Capacitance Effect
on page 71 and Long Wire — Resistance Effect on page 72.
TIP The SI safety relay does not have terminals S32 and S42.
Volts
DMM
Volts
DMM
Pulse
Testing
Outputs
S11
S21
Device 1 Device 2
S12
Input 2Input 1
S22
S32
S42
14
18
A2
Volts
DMM
Volts
DMM
Pulse
Testing
Outputs
S11
S21
Device 1 Device 2
S12
Input 2Input 1
S22
S32
S42
14
18
A2
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