Allen-Bradley 1771-DXPS Serial Expander Module – Dual Isolated Serial Ports
1771 Control Coprocessor Expander
Dual Serial Ports COMM2 / COMM3
1771-DXPS datasheet
Place of Origin:
USA
Brand Name:
Allenbradley
1771 Control Coprocessor Expander
,Dual Serial Ports COMM2 / COMM3
,1771-DXPS datasheet
Allen-Bradley 1771-DXPS
Serial Expander Module for the 1771 Control Coprocessor system, adding two isolated serial communication ports and front-panel control features.
Serial Expansion for Control Coprocessors
Technical Specifications
01 — Product Identification & Hardware
| Manufacturer | Allen-Bradley |
|---|---|
| Catalog Number | 1771-DXPS |
| Product Type | Serial Expander Module |
| System Family | 1771 Control Coprocessor / 1771 Universal I/O System |
| Associated Main Modules | 1771-DMC, 1771-DMC1, 1771-DMC4 |
| Communication Ports | COMM2 and COMM3 |
| Port Connector | 25-pin serial connectors |
| Display | 4-character alphanumeric ASCII display |
| Reset Control | 2-position, spring-loaded keyswitch |
| Status Indicators | COMM2 and COMM3 status LEDs |
02 — Serial Communication
| Supported Standards | EIA RS-232C, RS-423 and RS-485 |
|---|---|
| RS-422A Compatibility | Compatible with most RS-422A equipment when termination resistors are not used and distance / transmission rate are reduced to 200 ft at 19.2 kbps |
| Port Isolation | Optically isolated serial communication ports |
| Communication Rates | 110, 150, 300, 600, 1,200, 2,400, 4,800, 9,600 bps; 19.2 kbps and 38.4 kbps |
| Typical Connected Devices | Terminals, personal computers, bar-code readers, weigh scales and printers |
03 — Electrical & Relay Ratings
| Backplane Current | 1.5 A at +5 VDC |
|---|---|
| Fault Relay Capacity | 500 mA at 30 VAC/DC, resistive load |
| Relay Contacts | Normally open (NO) / normally closed (NC) connection positions |
| Relay Operation | Activated when the main module faults or when the main module is not adjacent to the expander module |
04 — Environmental & Installation Conditions
| Operating Temperature | 0 to 60°C (32 to 140°F) |
|---|---|
| Storage Temperature | -40 to 85°C (-40 to 185°F) |
| Relative Humidity | 5–95%, non-condensing |
| Mounting Location | 1771 I/O chassis |
| Module Position | Immediately adjacent to the control coprocessor main module, in the same module pair and under the same locking tab |
| Certification | CSA certified, CSA Class I Division 2 Groups A, B, C, D and UL listed, only when marked on the product |
Installation & Configuration Notes
Mounting Arrangement
The expander is not installed as an independent adjacent I/O card. It must be positioned directly beside the coprocessor main module and secured under the same locking tab.
- Switch off power to the 1771 I/O chassis before installation.
- Insert the expander into the slot immediately adjacent to the main module.
- Seat the module in the backplane connector and close the locking tab.
Port Setup
COMM2 and COMM3 are configured using their respective seven-position switch blocks. The selected switch settings depend on the serial communication standard required by the connected equipment.
- RS-232C
- RS-423
- RS-485
- RS-422A equipment under the documented operating limitations
Application & Failure Scenarios
Where It Is Used
1771-DXPS expands the serial interface capacity of a 1771 Control Coprocessor installation. The additional ports can connect peripheral equipment such as operator terminals, PCs, barcode readers, weighing equipment and printers.
Why Customers Search for It
Maintenance teams may search for this module when an expander port, reset control, display or fault-relay function is damaged or when an existing coprocessor assembly needs its original serial expansion hardware restored.
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Frequently Asked Questions
1. What is the function of the 1771-DXPS?
It is the optional serial expander module for the 1771 Control Coprocessor. It adds COMM2 and COMM3 serial ports, a reset keyswitch, a four-character ASCII display and a fault relay.
2. Which main modules are listed for use with the 1771-DXPS?
The Rockwell Automation manual identifies the 1771-DMC, 1771-DMC1 and 1771-DMC4 as control-coprocessor main modules in the same product family.
3. Which serial communication standards are supported?
COMM2 and COMM3 support RS-232C, RS-423 and RS-485. Most RS-422A equipment can also be used under the manual's stated limitations for termination, cable distance and transmission rate.
4. Can the expander module be installed in a separate slot from the main module?
No. The serial expander must be immediately adjacent to the coprocessor main module, within the same module pair and under the same locking tab.
5. What should be checked before replacing a 1771-DXPS?
Confirm the full catalog number, associated coprocessor main module, chassis arrangement, COMM2/COMM3 switch settings and connected serial-device requirements before ordering or installation.
Related Models
Additional industrial automation part numbers supplied for sourcing reference. Listing does not indicate direct compatibility with 1771-DXPS.
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