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Yokogawa ACM11-S2 Serial Communication Module

Configured for RS-232C serial interfacing in Yokogawa Distributed Control Systems (DCS) and Field Control Units (FCUs), the Yokogawa ACM11-S2 (ACM11 Serial Communication Module) provides direct electrical execution of point-to-point data exchange with intelligent field devices.

Hardware Specifications

Parameter	Specification
Model Number	ACM11-S2
Brand	Yokogawa
Origin	Japan
Weight	1.90 lbs (0.86 kg)
Dimensions	Standard rack slot width
Operating Temp	-20 degC to +70 degC
Power Consumption	< 1 W
Communication Protocol	RS-232C
Data Rate	Up to 230 Kbps
Mounting	DIN rail / Rack Slot

Channel-to-Channel Isolation and Loop Integrity

The module employs channel-to-channel isolation to suppress transient noise coupling across the backplane bus. It supports 4-20 mA HART loop protocol translation when interfacing with legacy analog devices via external converters. Cold junction compensation logic is managed by the host FCU to ensure accurate thermocouple data alignment when the module is paired with temperature input assemblies.

Frequently Asked Questions

Q: Does the ACM11-S2 support hot-swapping while the rack is powered?

A: No. Remove system power before inserting or removing the module to prevent backplane arcing and data corruption.

Q: What is the maximum cable length supported for RS-232C at 230 Kbps?

A: Maximum recommended cable length is 15 meters (49 feet) to maintain signal integrity at maximum data rates.

Q: Is firmware flashing required for S2 hardware compatibility?

A: Firmware must match the host FCU version. Incompatible firmware loads will result in a watchdog fault on module initialization.

Field Installation Guidelines

Mount the module onto a standard 35 mm DIN rail or secure it into the designated Yokogawa base plate slot. Ensure the retaining clips are fully engaged. Terminate RS-232C conductors using shielded twisted-pair cabling. Ground the shield drain wire to the rack ground bus bar at one end only to prevent ground loops. Verify torque specifications on terminal screws do not exceed 0.5 N·m.

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