Field Wiring Guidelines
Original instructions
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Overview
Inputs are field wired to row 1 of the base. The outputs are field wired to row 2. This section contains wiring guidelines and precautions.
Terminal Connector
To connect field devices to the I/O base, you need a field wiring terminal connector. Schneider Electric sells terminal connectors in sets of three.
Type
Part Number
Screw-in
170 XTS 001 00
Spring-clip
170 XTS 002 00
Busbar May Be Required
Depending on the type of field devices you are using, you may need a 1-row busbar. The following busbars are available from Schneider Electric.
Type
Part Number
Screw-in
170 XTS 006 01
Spring-clip
170 XTS 007 01
Mapping Terminal Blocks
CAUTION
POTENTIAL FOR SHORT CIRCUITS AND/OR POWER-UP SPIKES
Provide external fuses on the operating voltage to protect the module. Appropriate fuse values are shown in the wiring illustration. An unprotected module may be subject to short circuits and/or power-up spikes.
Failure to follow these instructions can result in injury or equipment damage.
The following table shows mapping terminal blocks and optional busbars.
Row
Terminal
Function
1
1...10
Inputs
11, 12
Input voltage for terminal pins 9 ... 10, (1L+)
13, 14
Return (M-) for the inputs
15, 16
Not connected
17
Return (N) for the module’s operating voltage
18
120 VAC Operating voltage (L1)
2
1 ... 8
Input voltage for pins 1 ... 8, (1L+)
9 ... 12
Outputs for group 1
13 ... 16
Outputs for group 2
17
Output Voltage for relays 1 ... 4 (1L1, 20 ... 115 VDC or 24 ... 115 VAC
18
Output Voltage for relays 5 ... 8 (2L1, 20 ... 115 VDC or 24 ... 115 VAC
3
1 ... 8
Return (M-) for the inputs
9, 10, 11, 12
Return (1N) for the relays 1 ... 4
13, 14, 15, 16
Return (2N) for the relays 5 ... 8
17/18
Return/Neutral for relay outputs
4
1 ... 18
Protective earth (PE)
Protective Circuit Required
To reduce the effects of radiated noise, you must add snubbing components across inductive load devices. The following table provides generic selection guidelines:
Type of Load
Suppression Device
Minimum Component Rating
AC circuits
50 Ω resistor in series with a 0.47 μfd nonpolarized capacitor across the load
for 120 VAC-powered loads
200_VAC
DC circuits
a reverse-biased clamping diode across the load
2 A and greater than twice the maximum load voltage
Consult relay and contactor manufacturers’ catalogs for commercial suppression devices matched to your particular products.
Wiring Inputs to Avoid Error Messages
To avoid I/O error messages, follow these guidelines when wiring.