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Sixteen AC outputs in one PLC-5 slot.
The 1771-OMD is a 16-point AC output module for the 1771 I/O architecture. It is designed for general-purpose 220V AC-class switching applications, with an operating range of 184…250V AC at 47…63 Hz. The module permits up to 2 A per output and 8 A total module current. The output stage also accommodates a 25 A surge for 100 ms, making load behavior and aggregate current important when selecting the module for replacement. Core selection point:
2 A per point does not mean 16 × 2 A can be continuously loaded simultaneously. The module-wide limit is 8 A. |
OUTPUT BEHAVIOR
|
|
2A
PER OUTPUTIndividual channel ceiling |
8A
PER MODULEAggregate continuous module limit |
25A
SURGE100 ms output surge capability |
184–250V
AC RANGE47–63 Hz |
| Field wiring architecture The 1771-OMD is associated with the 1771-WH wiring arm, while fused wiring-arm options are available for applications where individual output fuse protection is required. |
Inductive load consideration Solenoids, motor starters, relays and similar inductive devices can generate transients. Appropriate suppression should be considered to protect switching circuitry and reduce electrical stress. |
| 1771-OMD 16 AC outputs 184…250V AC 2 A / output 8 A / module |
→ | 1771 CHASSIS The module occupies a 1771 I/O slot and communicates through the chassis backplane. |
→ | FIELD LOADS AC loads such as contactors, relays, solenoids and compatible motor-starter coils. |
| 1771-OM An 8-point AC output family. The 1771-OMD provides twice the channel count and a different overall load capacity. |
1771-OR A different isolated AC output architecture. It should not be treated as a direct electrical substitute merely because it belongs to the same 1771 family. |
| Modern conversion planning Rockwell conversion documentation shows that the 1771-OMD's 2 A/point and 8 A/module ratings differ significantly from some modern replacement modules, so a conversion should be engineered from the actual load rather than based only on point count. |
Best replacement scenario The 1771-OMD is particularly relevant where an existing PLC-5 installation must retain its established 1771 AC output architecture. |
| Sales Manager Miya zheng |
EMAIL SALES | WHATSAPP 86-18020776792 |
| 01 — Can the 1771-OMD replace another 16-point AC module without checking the field load? No. The 1771-OMD has its own 184…250V AC range, 2 A per output and 8 A module-wide rating. A replacement must be checked against the actual field voltage and load current. |
| 02 — What is the most common mistake when sizing 1771-OMD for multiple loads? Checking only the 2 A per-output rating. Several individually acceptable loads can still exceed the 8 A total module limit. |
| 03 — Why does the 1771-OMD's 25 A surge rating matter during replacement? Loads with high inrush or transient current can impose short-duration stress beyond their normal operating current. The module's 25 A / 100 ms surge rating is therefore relevant when evaluating actual load behavior. |
| 04 — Can 1771-OMD be selected simply because the existing chassis is a 1771 chassis? No. The chassis family is only one part of the compatibility check. The AC voltage, point count, wiring arm, load current and field device characteristics also need to match. |
| 05 — Is 1771-OMD a reasonable choice for maintaining an existing PLC-5 system? Yes, where the existing architecture requires this 1771 AC output function and the electrical ratings match. For modernization projects, the actual field load should be used to engineer any conversion rather than assuming a newer module is electrically equivalent. |
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