5A26141G06 | Emerson | Local I/O Bus Cable

Configured for serial data exchange in Ovation distributed control systems, the Emerson 5A26141G06 (5A26141G06 Local I/O Bus Cable) provides direct physical electrical execution for interconnecting local I/O modules with host controllers. This 4.5-foot cable assembly utilizes an RS-485 data format, facilitating deterministic communication links between I/O assemblies and controller nodes at baud rates up to 19.2 kbps.

Hardware Specifications

4-20 mA HART Loop Protocol Connectivity

The 5A26141G06 cable assembly is constructed with dual-layer braid and foil shielding to maintain signal integrity in environments where high-frequency electromagnetic interference (EMI) is present. This shielding strategy is required to minimize bit error rates when the cable is routed near process instrumentation operating on 4-20 mA HART loop protocol signals. By maintaining constant characteristic impedance through the coaxial construction, the cable ensures that RS-485 differential signals remain protected from external common-mode noise, preventing data corruption within the Ovation control bus.

Frequently Asked Questions (FAQ)

Q: Can this cable be utilized for long-distance I/O extensions?

A: The 5A26141G06 is designated as a local I/O bus cable with a fixed length of 4.5 feet. Exceeding recommended cable lengths for RS-485 communication can result in signal attenuation and timing violations; consult the Ovation system manual for maximum bus length specifications.

Q: Are there specific grounding requirements for the DB9 shield termination?

A: Yes, the cable shield must be bonded to a low-impedance earth ground at the cabinet entry point. Failure to properly terminate the shield can lead to ground loops and significant noise injection into the serial data stream.

Field Installation Guidelines

1. Inspect both DB9 male connectors for bent pins or debris before engagement with the I/O module ports.
2. Align the connectors carefully and secure the retaining screws to ensure a stable physical connection.
3. Route the cable through dedicated signal wireways, maintaining separation from high-voltage AC lines or motor power cables to mitigate crosstalk.
4. Ensure the cable maintains a minimum bend radius consistent with 24 AWG coaxial standards to prevent internal conductor fatigue.
5. Verify communication link status via the Ovation controller software after installation to confirm that no packet loss occurs at the 19.2 kbps operating speed.