Wire input devices, Input devices with mechanical contacts, Input devices with ossd outputs – Rockwell Automation 440C Guardmaster 440C-CR30 Configurable Safety Relay User Manual User Manual
Page 22: Figure 6 - input devices with mechanical contacts, Figure 7 - input devices with ossd outputs
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Rockwell Automation Publication 440C-UM001C-EN-P - November 2014
Chapter 3
Power, Ground, and Wiring
Wire Input Devices
Input Devices with Mechanical Contacts
Input devices with mechanical contact outputs, such as emergency stop buttons
and safety limit switches, use both a safety input terminal and a test output
terminal. This enables the circuit to achieve a Category 4 rating.
When safety devices are connected via test outputs to an input circuit on the
CR30 relay, the recommended wire length is 30 m (98.4 ft) or less.
Figure 6 - Input Devices with Mechanical Contacts
Input Devices with OSSD Outputs
Devices, such as light curtains, laser scanners, and solid-state interlocks, having
current-sourcing PNP semiconductor outputs (OSSD) have built-in test pulses
(or other method of detecting faults). These devices are connected directly to the
inputs of the CR30 relay safety and do not use a test output. These devices must
have a common reference with the CR30.
Figure 7 - Input Devices with OSSD Outputs
WARNING: Applying an inappropriate DC or any AC voltage can result in a loss
of safety function, product damage, or serious injury. Properly apply only the
specified voltage to relay inputs.
10
11
12
A2
A1
13
14
15
16
17
18
19
20
21
Input Terminal Block
Configured for
Pulse Test Output
Input/Output Terminal Block
+24 V DC
24 V Common
3mA Typical
+DC
24V
COM
0V
09
00
01
02
03
04
05
06
07
08
Must have common reference.
Input Terminal Block
Input/Output Terminal Block
+24 V DC
24 V Common
OSSD1
Receiver
+
+
-
-
Transmitter
OSSD2
10
11
12
A2
A1
13
14
15
16
17
18
19
20
21
+DC
24V
COM
0V
09
00
01
02
03
04
05
06
07
08