3.8.5 Wire the Switch in Series
To monitor several movable safety guards with a series connection of SI-RF Safety Switch, follow these steps.
1. Connect the safety outputs of the last SI-RF Safety Switch to a safety monitoring unit.
2. Connect the safety inputs of the first SI-RF Safety Switch of the series to + 24 V DC.
3. Connect the safety outputs of the first SI-RF Safety Switch to the safety inputs of the second SI-RF Safety Switch
(and second to third, etc).
4. When all the safety guards are closed (all actuators are detected), the last SI-RF Safety Switch of the series
connection switches on its safety outputs.
5. If you are using an optional In-Series Diagnostic (ISD) device (SI-RFD series), integrate the diagnostic device
between the last SI-RF Safety Switch and the safety monitoring module in the series connection. The status
information can then be retrieved from the diagnostic device.
Note: Verify the SI-RF Safety Switch and the safety monitoring module are powered from the same power
supply or the commons of the separate supplies are the same.
If you are using the optional PNP auxiliary output (SI-RFS series), only the non-safety related status information of each
individual sensor can be obtained.
After the door is closed, the optional reset function requires a manual acknowledgement before the safety output of the
sensor is switched on (only that individual sensor, not the series string).
8
Rd
1
Wh
5
Gy
2
Bn
4
Ye
3
Gn
6
Pk
+
Q1
Do
Q2
I1
I2
–
SI-RF 2
24V
24V
n.c.
7
Bu
Do
7
Bu
1
Wh
5
Gy
6
Pk
+
Reset
I1
I2
SI-RF 3
24V
8
Rd
2
Bn
4
Ye
3
Gn
Safety
Controller
Q1 Q2
–
PNP/
OUT
PNP/
OUT
PNP/
OUT
8
Rd
1
Wh
5
Gy
2
Bn
4
Ye
3
Gn
6
Pk
+
Q1
Do
Q2
I1
I2
–
SI-RF 1
n.c.
7
Bu
Figure 6. Wiring the switch in series
3.8.6 Wire the Switch in Series Using the Quick Disconnect
Use models SI-RFS and SI-RFD for this configuration.
When connecting units in series, simplify the wiring using special t-adapters and low cost unshielded four-wire double-
ended cables. A similar configuration is shown except the connections are all made using quick disconnects. The SSA-
EB1Plx-0Dx E-Stops and SI-RFD switches can be connected in a single chain.
1. Connect the female 4-pin M12-Euro-style cable to the male 4-pin M12/Euro-style of the series connection t-adapter
(SI-RFA-TS).
2. If a manual reset model sensor is used, connect the female 8-pin M12/Euro-style of the Reset T-Adapter (SI-RFA-
TK) to the male 8-pin M12/Euro-style connector of the series connection t-adapter. Connect a female 4-pin M12/
Euro-Style cable to the male 4-pin M12/Euro-style QD of the t-adapter for connecting a reset switch or reading the
Auxiliary output.
3. Connect the sensor to the male 8-pin M12 connector of the t-adapter.
4. Connect the male 4-pin M12 end of a double ended cable to the female 4-pin M12 of the t-adapter. Connect the
female 4-pin M12 end of the double ended cable to the next series connection t-adapter (SI-RFA-TS).
5. At the end of the line a terminating plug (SI-RFA-P) is required to properly truncate the system.
6. The wired end of the 4-pin M12 cable (from step 1) can be wired directly to a Safety Monitoring Module or can be
wired through an In-Series Diagnostic (ISD) module then to the Safety Monitoring device.
Verify that the SI-RF Safety Switch and the safety monitoring module are powered from the same power supply or the
commons of the separate supplies are the same. Ensure that the voltage level at SI-RF 1 (furthest from the power supply) is
above 19.5 V for the system to operate properly.
SI-RF Non-Contact RF Safety Switch
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