ACM12/ZCT Yokogawa CENTUM Datasheet & Technical Manual

Communication Module Serial Interface | Yokogawa ACM12/ZCT ACM12

Communication Module Serial Interface | Yokogawa ACM12/ZCT ACM12

Availability: 20 left in stock

Yokogawa ACM12 CENTUM Communication Module The Yokogawa ACM12/ZCT, also cataloged as the ACM12 Communication Module, operates as a dedicated hardware...

SKU: ACM12/ZCT

Manufacturer: Yokogawa
Product No.: ACM12/ZCT
Product Type: Communication Modules
Product Origin: JAPAN
Payment:T/T, Western Union
Weight: 800g
Shipping port: Xiamen
Warranty: 12 months

Description Reviews

Yokogawa ACM12 CENTUM Communication Module

The Yokogawa ACM12/ZCT, also cataloged as the ACM12 Communication Module, operates as a dedicated hardware component for serial communication within Yokogawa CENTUM platforms.

Suffix Breakdown & Model Matrix

Suffix Code	Option	Description
ACM12	Base Model	RS-422/RS-485 serial communication module
/ZCT	Dedicated Interface	Custom terminal/cable interface variant

Hardware Specifications

Parameter	Specification
Model	ACM12/ZCT
Brand	Yokogawa
Origin	Japan
Weight	0.8–1.2 kg
Dimensions	130 mm x 35 mm x 128 mm
Operating Temp	0 deg C to 55 deg C
Power Consumption	1.0–2.5 A at 5 V DC
Interface Ports	1 RS-422/RS-485 port
Communication Protocols	RS-422 (full-duplex), RS-485 (half-duplex)
Baud Rates Supported	1200 / 2400 / 4800 / 9600 / 19200 / 38400 bps
Transmission Code	ASCII / Binary
Data Framing	Character length: 7 or 8 bits; Stop bit length: 1 or 2 bits
Parity Options	None / Even / Odd
Maximum Transmission Distance	Up to 1200 m (total cable length)
Terminal Connection	6-pole terminal with M4 screw connection
System Compatibility	Yokogawa CENTUM CS / CENTUM VP systems

Serial Data Execution and Channel Isolation

The ACM12/ZCT module executes point-to-point and multipoint differential serial data exchange across distributed process loops. Differential signaling suppresses common-mode noise across long-distance cable runs up to 1200 meters. The module transfers field data into the host DCS system backplane using start-stop bit framing and configurable parity checks. Galvanic isolation across the serial interface protects internal system logic from external field surge transients and ground potential variations.

Frequently Asked Questions

Q: How should line termination resistors be applied across an RS-485 multipoint bus connected to the module?

A: Install a 120 ohm matching termination resistor across the differential signal line pair (+ and -) at both physical ends of the RS-485 trunk cable. Terminating intermediate nodes causes excessive bus loading and degrades signal amplitude.

Q: Can the module be inserted into an active communication slot under power?

A: Always isolate power to the rack or follow station-specific hot-swap safety protocols before removing or inserting the module. Uncontrolled insertion into a live backplane may cause transmission errors or initiate a transient reset on the serial bus.

Field Installation Guidelines

Mount the module into its designated communication slot within the system rack. Secure all physical chassis fasteners to maintain mechanical grounding and prevent connection fatigue from panel vibration.

Utilize shielded twisted-pair cables for all RS-422/RS-485 field runs. Connect signal drain wires to the designated M3/M4 shield ground terminal at a single cabinet point to prevent circulating ground loops. Maintain separation between serial communication lines and high-voltage AC power wiring inside the enclosure channels.

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