PLCs, Power Supplies & Others

The Yokogawa ACM22RS-422/485 delivers two independent serial channels for the CENTUM DCS. This module supports both RS-422 and RS-485 protocols on each port. Consequently, you can connect multiple field devices across a long-distance network. Each channel operates separately with its own baud rate and parity settings.

This communication module uses differential signaling for superior noise immunity. Therefore, it allows cable runs up to 500 meters without any signal degradation. The Yokogawa ACM22RS-422/485 handles multi-drop configurations with up to 32 devices per line.

Technical Specifications

Many engineers integrate this module with protection relays like the RMS-TSG-TZ-C Static Trip for complete system safety . The Yokogawa ACM22 excels in demanding industrial communication tasks.

Hardware & Interface Details

The Yokogawa ACM22RS-422/485 occupies a single slot in the Communication Module Nest. You need dedicated AKB337 or AKB339 cables for proper line termination. Each channel includes built-in termination resistors on the printed circuit board. This design simplifies installation and reduces external component requirements.

Furthermore, this module supports data rates from 1200 bps up to 19200 bps. It uses start-stop synchronization for reliable character framing between devices. The Yokogawa ACM22RS-422/485 also provides built-in surge suppression for harsh factory floors.

Installation & Power Management

This communication module draws a maximum of 1.8 A from a 5.0 V DC supply. It stores negligible energy internally, allowing safe hot-swapping in most rack configurations. Engineers value the dual-port design for reducing total module count significantly.

You can configure each channel’s station address and termination via DIP switches. The operating temperature ranges from 0°C to 55°C for standard indoor control rooms. For outdoor installations, Yokogawa recommends additional environmental protection measures.

Details