1738-OE4CM12 | Allen-Bradley | ArmorPoint Analog Output Module

Configured for distributed analog control in on-machine environments, the Allen-Bradley 1738-OE4CM12 (1738-OE4CM12 Analog Output Module) provides direct physical/electrical execution of 4-point current-based output signals within ArmorPoint I/O systems.

Hardware Specifications

Profinet / EtherNet/IP Deterministic Networks

The 1738-OE4CM12 is designed for deployment in architectures utilizing EtherNet/IP deterministic networks, enabling robust analog control performance at the machine level. This module facilitates efficient I/O density scaling by supporting decentralized analog output distribution, which reduces lengthy shielded cable runs back to the main control cabinet. Firmware flash compatibility is maintained through the Logix controller environment, ensuring consistent signal output behavior and diagnostic reporting. The module’s deterministic timing allows for precise control of variable speed drives, proportional valves, or other current-controlled actuators integrated within the control network.

Frequently Asked Questions

Q: Does the module support hot-swapping under power?

A: The module is intended for on-machine mounting; however, disconnection or connection of the M12 I/O cables under power should be limited to maintenance scenarios, ensuring the system logic is in a safe state to prevent unexpected output transients.

Q: Is external channel-to-channel isolation provided?

A: The module provides standard electrical isolation as defined in the ArmorPoint specifications; however, users should perform loop analysis for ground-sensitive analog circuits to prevent potential ground-loop interference.

Field Installation Guidelines

1. Mount the module directly to the machine frame using the integrated mounting points, ensuring the chassis is bonded to a solid electrical ground reference.
2. Connect the 24 VDC power supply and analog output devices using standard M12 cordsets; verify the pinout against the module documentation to prevent signal-to-power shorts.
3. Ensure all unused M12 ports are capped to maintain the IP rating and protect internal electronics from moisture and conductive debris.
4. Route output cabling through properly grounded conduits or cable trays to minimize electromagnetic interference from high-voltage power lines or VFD outputs.
5. Verify output signal scaling and configuration within the PLC project settings to ensure the current output maps correctly to the controlled device range.
6. Periodically check all M12 connector unions for tightness and signs of corrosion, applying dielectric grease if operating in high-humidity or harsh industrial environments.