Technical Data · Publication 1492-TD008 · Rockwell Automation
Bulletin 1492 — Technical Data (1492-TD008)
Specifications, catalog numbers, dimensions, and selection data for the Allen-Bradley Bulletin 1492 wiring system: Interface Modules (IFMs), Interface eXpander Modules (XIMs), Analog Interface Modules (AIFMs), and pre-wired cables that connect ControlLogix, CompactLogix, SLC 500, MicroLogix, and Flex I/O modules to field devices.
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Specifications
Electrical Ratings
| Voltage range (digital IFMs) | 0-132V AC/DC (narrow), 0-264V AC/DC (standard) |
|---|---|
| Max current per circuit | 2 A |
| Max current per module | 12 A |
| Max recurring peak voltage | 600 Vp |
| Max peak transient voltage | 600 V (use 2.5 kV suppressor above 600V) |
| Relay (XIM) contact rating | 240V AC, 10 A Form C (de-rated to 12 A per adjacent pair) |
| Relay coil voltages | 120V AC or 24V AC/DC, field-replaceable |
| LED indicator current | 2.0-2.5 mA (typical for 24V / 120V versions) |
Mechanical & Wiring
| Terminal block wire range (fixed screw) | #12 to #22 AWG (4.0-0.2 mm²) |
|---|---|
| Terminal block wire range (removable screw) | #12 to #22 AWG (2.5-0.5 mm²) |
| Terminal block wire range (removable push-in) | #12 to #26 AWG (2.5-0.2 mm²) |
| Wire strip length | Fixed screw 8.0 mm; Rem. screw 7.0 mm; Push-in 10.0 mm |
| Terminal screw torque | 3.5-4.5 lb-in (0.38-0.50 Nm) |
| Max wires per terminal | 3 wires (#18-#22 AWG), 2 wires (#16 AWG), 1 wire (#12-#14 AWG) |
| Mounting | Standard DIN #3 rail |
| Cable AWG | #22 AWG standard; #18 AWG on most I/O-ready cables; #26 AWG option |
Environmental
| Operating temperature | 0-60 °C |
|---|---|
| Storage temperature (modules) | -40 to +85 °C |
| Storage temperature (cables) | -20 to +80 °C |
| Operating humidity | 5-95% non-condensing |
| Operating vibration | 2.5 G at 10-2000 Hz |
| Operating shock | 15 G |
| Pollution degree | 2 |
Physical / Form Factor
| Standard IFM footprint | 4.33 x 3.27 x 2.78 in. (110 x 83 x 70.5 mm) |
|---|---|
| Narrow IFM footprint | 2.36 x 3.27 x 2.78 in. (60 x 83 x 70.5 mm) |
| Reduced-height IFM footprint | 4.72 x 2.78 x 2.78 in. |
| Cable connector sizes | 20-pin (8-16 I/O points), 40-pin (16-32 I/O points) |
| Analog D-shell connector | 15-pin or 25-pin D-shell (44/58 mm wide) |
| Standard cable lengths | 0.5 m, 1.0 m, 2.5 m, 5.0 m (custom lengths available) |
| Approx. shipping weight (IFM) | 0.62-0.77 lb (278-351 g) |
Catalog Number Format
How to read an Allen-Bradley 1492 catalog number. Each position encodes a specific configuration attribute.
Position
Meaning
Example
1492
Bulletin prefix (Programmable Controller Wiring Systems)
1492
-IFM / RIFM / XIM / RXIM / AIFM
Module class: IFM = Interface Module, RIFM = removable terminal variant, XIM = Interface eXpander (with relays/fuses), AIFM = Analog IFM
IFM = fixed terminal interface module
20 / 40
Connector pin count (20-pin for 8-16 I/O points, 40-pin for 16-32 I/O points)
20 = 20-pin connector
F / FH / FN / FNH / D24 / D120 / D24N / D240
Function / voltage: F = feed-through 264V, FH = reduced-height, FN = narrow 132V, D24/D120/D240 = LED voltage indication at that voltage
D24 = LED indicating 24V AC/DC
-2 / -3 / -4
Terminals per I/O point (2 = extra terminals, 3 = 3-wire sensor, 4 = isolated)
-2 = two terminals per I/O point
-F / -FS / -DS / -TIFM
Option suffix: F = fused, FS = fused with blown-fuse indication, DS = point-to-point isolated, TIFM = transparent cover
-F120 = fused for 120V
-A / (no A)
Variant: -A denotes the 'A' revision / alternate voltage (e.g. 120V AC-specific build)
120A = 120V AC variant
Certifications & Compliance
cULus Listed, Hazardous Locations Class I Div 2 Groups A, B, C, D (UL File E10314, Guide NRAG) — modules without relays
cULus Listed, Ordinary Locations (UL File E113724, Guide NRAQ) — modules with relays
Factory Mutual (FM) Class I Div 2 Groups A, B, C, D hazardous locations (file J.I.3000590)
CE compliant for all applicable directives
Temperature Code T3C @ 60 °C (hazardous-location rating)
Document Contents
Full PDF covers the following topics in detail:
- Introduction: benefits of pre-wired wiring systems vs. point-to-point (up to 30x faster install, 100% continuity-tested, reduced DIN rail density)
- 1756 ControlLogix wiring systems: full AC/DC digital, relay, and analog I/O cross-reference with required IFM/RIFM, RTB plug, and cable catalog numbers (pp. 4-81)
- 1769 CompactLogix and CompactLogix 5370 wiring systems (pp. 82-136)
- 1746 SLC 500 and 1762/1764 MicroLogix wiring systems (pp. 137-206)
- Digital IFM selection: standard, narrow, reduced-height, sensor, LED-indicating, fusible, and isolated variants (pp. 207-269)
- Analog AIFM selection with D-shell connectors for 1756, 1769, 1746, and 1794 analog I/O (pp. 270-290)
- Relay Master and Relay Expander (XIM) modules: 120V/24V coils, Form C contacts, transient suppression, 8- or 16-point formats
- Marking systems: pre-printed and blank adhesive label cards per I/O module + IFM pairing (pp. 291-293)
- Dimensions: 20-pin and 40-pin cable connectors, 15/25-pin D-shell, and standard wiring-system module footprint (pp. 294-296)
- Accessories: 1492-IFMFH1 fuse holders, 1492-ISOSW-1 isolation-switch plugs, 1492-SJM5-10 side jumpers, and removable terminal blocks 1492-RTB20N/RTB20P (p. 297)
- General Wiring System Specifications: agency approvals, terminal torque, wire range, environmental (p. 298)
- Replacement relays for every XIM Relay Master/Expander, cross-referenced to 700-HK and 700-TBR/TBS replacements (p. 298)
Frequently Asked Questions
What is a Bulletin 1492 wiring system and why use it?
A pre-wired interface-module system that replaces point-to-point wiring between an Allen-Bradley PLC I/O module and field terminals. A ribbon cable drops from the I/O module onto a DIN-rail-mounted IFM, which breaks each channel out to screw or push-in terminals. Installation is up to 30 times faster than traditional wiring; cables are 100% continuity-tested at the factory and ship with pre-printed adhesive labels matched to the specific I/O module.
What PLC platforms does Bulletin 1492 cover?
1756 ControlLogix, 1769 CompactLogix (including 5370 controllers), 1746 SLC 500, 1762 and 1764 MicroLogix, 1794 Flex I/O (through 1794-TB37DS / 1794-TB62DS D-shell base modules), MicroLogix 1200/1500 packaged controllers, and selected 700S/700H and PowerFlex I/O.
What's the difference between an IFM, an XIM, and an AIFM?
IFM = Interface Module for digital I/O (feed-through or LED/fuse variants). XIM = Interface eXpander Module that adds field-replaceable relays or fuses to digital outputs (Form C contacts, 240V 10 A). AIFM = Analog Interface Module with 15- or 25-pin D-shell connectors for analog input/output modules. RIFM / RXIM / RAIFM are the same devices with removable terminal blocks (RTBs) instead of fixed screw terminals.
What cable lengths and wire gauges are available?
Standard lengths are 0.5 m (code 005), 1.0 m (010), 2.5 m (025), and 5.0 m (050); custom lengths are available. Digital pre-wired and IFM-ready cables use #22 AWG conductors rated 2 A per channel. A #26 AWG variant (append 26 to the cat. no.) is offered for greater flexibility but is limited to 1 A per channel. I/O-module-ready cables use #18 AWG for higher current or longer runs.
What wire range and torque do the 1492 terminal blocks accept?
Fixed screw style: #12 to #22 AWG (4.0-0.2 mm\u00B2), 8.0 mm strip length, 3.5-4.5 lb-in (0.38-0.50 Nm) torque. Removable screw style: #12 to #22 AWG (2.5-0.5 mm\u00B2), 7.0 mm strip, same torque. Removable push-in style: #12 to #26 AWG (2.5-0.2 mm\u00B2), 10.0 mm strip, no torque required. Max wires per terminal: 3 for #18-#22 AWG, 2 for #16 AWG, 1 for #12-#14 AWG.
Do I need to order the removable terminal block plugs separately?
Yes. For RIFM / RXIM / RAIFM modules, the RTB plugs ship separately and come two per pack. Screw-style plugs use catalog number 1492-RTB20N; push-in-style plugs use 1492-RTB20P. You need two plugs per IFM (one per terminal row) for a complete assembly.
Are Bulletin 1492 wiring systems approved for hazardous locations?
Yes, with caveats. Modules and cables without relays are cULus Listed for Class I Div 2 Groups A-D (UL File E10314, Guide NRAG) and FM-approved for the same. Modules with relays (most XIMs) are cULus Listed for Ordinary Locations only (UL File E113724, Guide NRAQ). All 1492 products carry CE marking and a T3C temperature code at 60 \u00B0C.
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