Communications bus and supply power wiring guidelines - Metasys - M4-XPM04060 - M4-XPM09090 - M4-XPM18000 - Field Device - M4-XPM Expansion Module - 13.0

M4-XPM Expansion Modules Installation Guide

Brand
Metasys
Product name
M4-XPM Expansion Module
Document type
Installation Guide
Part number
24-10143-02147
Document revision
C
Version
13.0
Revision date
2023-10-02
Product status
Active
Language
English

Table 1 provides information about the functions, ratings, and requirements for the communication bus and supply power terminals. The table also provides guidelines for wire sizes, cable types, and cable lengths for wiring the expansion module's communication bus and supply power.

In addition to the guidelines in Table 1, observe the following guidelines when wiring an FC bus, SA bus, or the 24 VAC supply power:

  • Run all low-voltage wiring and cables separate from high-voltage wiring.
  • All SA and FC bus cables, regardless of wire size, should be twisted, insulated, stranded copper wire.
  • Shielded cable is strongly recommended for all SA and FC bus cables.
  • Refer to the MS/TP Communications Bus Technical Bulletin (LIT-12011034) for detailed information regarding wire size and cable length requirements for FC and SA buses.
Table 1. Communications bus and supply power terminal block functions, ratings, requirements, and cable guidelines
Terminal block/Port label Terminal labels Function, electrical ratings/Requirements Recommended cable type

FC BUS

or

SA BUS

+

-

FC or SA Bus Communications

FC Bus: 0.6 mm (22 AWG) stranded, 3-wire twisted, shielded cable recommended.

SA Bus: 0.6 mm (22 AWG) stranded, 4-wire (2 twisted-pairs), shielded cable recommended.

Note: On the SA Bus, the + and - wire are one twisted pair, and the COM and PWR are the second twisted pair of wires.

COM

Signal Reference (Common) for FC or SA Bus communications

SHD

or

PWR

SHD on FC Bus: Isolated terminal (optional shield drain connection

PWR on SA Bus: 15 VDC power lead connection. (Maximum total current draw for SA bus is 240 mA.)

Note: The PWR terminal on an XPM expansion module does not supply 15 VDC. The SA bus supervisor (CGE,CGM, CVE, CVM, FAC, FEC, VMA) supplies 15 VDC to devices on the SA bus requiring power.

SA/FC BUS

(Port)

  RJ-12 6-Position Modular Connector provides:
  • FC or SA Bus Communications
  • FC or SA Bus Signal Reference and 15 VDC Common

24 AWG 3-pair CAT 3 Cable <30.5 m (100 ft)

24V~

HOT

24 VAC Power Supply - Hot

Supplies 20–30 VAC (Nominal 24 VAC)

0.8 mm to 1.0 mm

(18 AWG) 2-wire

COM

24 VAC Power Supply - Common

(Isolated from all other Common terminals on controller.)

Note: See table labeled Cable length guidelines for recommended wire sizes for low-voltage (<30 V) Inputs and Outputs to determine wire size and cable lengths for cables.
Note: The SA Bus and FC Bus wiring recommendations in this table are for MS/TP bus communications at 38,400 baud. For more information, refer to the MS/TP Communications Bus Technical Bulletin (LIT-12011034) .