3.2.3
Compatible sensor types
The safety relay is suitable for:
•
Safety sensors and safety switches with volt-free output contacts, e.g.: Dual-chan‐
nel safety command devices (emergency stop pushbuttons, rope pull switches,
etc.), dual-channel contact-based interlocking devices (safety locking devices and
safety switches) and dual-channel magnetic safety switches with reed contacts
3.2.4
Restart interlock
A restart interlock can be implemented with a reset pushbutton.
3.2.5
External device monitoring
Permanent external device monitoring can be implemented using external wiring.
3.2.6
Cross-circuit detection
A cross-circuit is detected on the safety capable inputs.
3.2.7
Status indicators
LEDs
R
E
L
Y
PWR
OUT
13
23
I1
Y1
14
24
I2
Y2
A2
S1
33
A1
R1
34
X1
X2
PWR
OUT
13
23
I1
Y1
14
24
I2
Y2
A2
R1
A1
S1
X1
X2
EMSS3
1099973
R
E
L
Y
33
34
Figure 2: LEDs
The labeled positions are only partially assigned LEDs. The positions and their labeling
(except for the upper 2 lines) also show the pin assignment of the terminals on the front
connector.
Table 1: Safety relay indicators
Labeling
Color
Function
PWR
Green/Red
Voltage supply
OUT
Green
Enabling current paths
I1
Green
Safety capable input
I2
Green
Safety capable input
S1
Green
Reset pushbutton input, exter‐
nal device monitoring (EDM)
Y1
Green
Application diagnostic output
3
PRODUCT DESCRIPTION
10
O P E R A T I N G I N S T R U C T I O N S | ReLy EMSS3
8023937/2019-10-11 | SICK
Subject to change without notice
