Ethernet Communication Module Yokogawa ACM71

Suffix Breakdown & Model Matrix

Single model configuration: ACM71
No documented suffix extensions or variant encoding available in provided specification set. All functional characteristics apply to base module definition only.

Hardware Specifications

Ethernet Frame Transport & Field Control Integration

The ACM71 implements Ethernet-based deterministic frame handling over 10BASE-T physical media within CENTUM CS architecture. Signal exchange is executed through CSMA/CD arbitration logic, where SND and RCV indicators reflect transmit and receive buffer states at the module interface level. The RDY indicator reflects hardware initialization and bus synchronization status within the Communication Module Nest backplane environment.

Frequently Asked Questions

Q: Does the ACM71 support hot-swap removal during system operation?
A: No hot-swap behavior is defined in the provided specifications. Removal should be treated as a powered maintenance operation unless system-level redundancy architecture explicitly permits otherwise.

Q: What is the limitation of transmission distance per network segment?
A: The module supports up to 100 m per segment over twisted-pair 10BASE-T cabling under standard Ethernet physical layer constraints.

Q: How is network activity indicated on the module?
A: SND indicates transmit activity, RCV indicates receive activity, and RDY indicates internal hardware readiness status.

Field Installation Guidelines

The ACM71 shall be installed in the designated Communication Module Nest compatible with CENTUM CS3000/CS1000 architectures. RJ45 termination must follow standard 10BASE-T pinout conventions. Twisted-pair routing should maintain separation from high-voltage conductors to reduce electromagnetic coupling. Cable length per segment shall not exceed 100 m. Hub-based star topology is required for point-to-point node aggregation. Backplane seating must be fully engaged to ensure stable 5.0 VDC supply continuity.

Shielding is not specified for the transmission medium; however, industrial grounding practices for cabinet-level earthing should be maintained to stabilize reference potential across the communication frame boundary.