Yokogawa ACM12 RS-422/RS-485 Communication Module
Yokogawa ACM12
RS-422 / RS-485 Communication Module
Half-Duplex Serial Communication
Place of Origin:
JAPAN
Brand Name:
Yokogawa
Yokogawa ACM12
,RS-422 / RS-485 Communication Module
,Half-Duplex Serial Communication
YOKOGAWA ACM12
RS-422 / RS-485 Communication Module
A serial communication module used to exchange data between a Yokogawa Field Control Station and supported subsystem equipment such as PLCs. ACM12 supports point-to-point or multipoint connections, with communication settings determined by the connected subsystem and its software package.
Technical Specifications
Hardware Data1200 m
Maximum transmission distance
Total cable length, according to the published hardware specifications.
1200–19200
Communication speed (bps)
Five specified rates: 1200, 2400, 4800, 9600 and 19200 bps.
1 A
Current consumption
5.0 V DC.
| Product type | RS-422 / RS-485 communication module |
|---|---|
| Number of ports | 1 |
| Connection topology | Point-to-point or multipoint |
| Communication method | Half-duplex |
| Communication speed | 1200 / 2400 / 4800 / 9600 / 19200 bps |
View additional hardware and communication parameters
| Synchronization | Start-stop synchronization |
|---|---|
| Transmission code | ASCII / binary |
| Character length | 7 or 8 bits |
| Stop bits | 1 or 2 |
| Parity | None, odd or even. At 19200 bps, no parity cannot be specified. |
| Receive timing after transmission | 1 ms |
| Maximum transmission distance | 1200 m total cable length |
| Installation | Communication Module Nest |
| Connection terminals | 6-pole terminal, M4 screws |
| Wiring | Three-pair shielded cable; AKB161 is specified for connection between ACM12 and FA500, with a maximum cable length of 100 m. |
| Current consumption | 1 A at 5.0 V DC |
The 1200 m figure is the specified total transmission distance; the separate AKB161-to-FA500 cable specification is 100 m maximum.
Application & Failure Scenarios
System ContextACM12 provides a serial communication path between a Field Control Station and supported subsystem equipment. The communication software package defines which subsystem is being accessed.
Subsystem data exchange
Used for serial communications with supported external equipment, including PLC-related subsystems, within the applicable Yokogawa control-system configuration.
Communication interruptions
Loss of subsystem data, intermittent communications or a planned module replacement may prompt an ACM12 identification and communication-path assessment.
Loss of connected data
If the affected serial link carries operational data, a communication interruption may reduce data visibility or affect dependent control and monitoring functions.
Communication & Wiring Details
| Supported link type | RS-422 or RS-485, selected for the application |
|---|---|
| Connection mode | Point-to-point or multipoint |
| Cable arrangement | Three-pair shielded cable |
| Specified cable option | AKB161 for ACM12-to-FA500 connection; maximum 100 m |
| Data format settings | ASCII or binary; 7- or 8-bit character length; 1 or 2 stop bits; none, odd or even parity, subject to the 19200 bps parity restriction. |
For document searches, use the exact phrase Yokogawa ACM12 pdf/manual/datasheet to locate technical literature for this model.
Frequently Asked Questions
1. Which serial communication modes does ACM12 support?
ACM12 supports RS-422 or RS-485, with point-to-point or multipoint connections. The required mode depends on the connected equipment and the communication setup.
2. What transmission speeds are available?
The specified rates are 1200, 2400, 4800, 9600 and 19200 bps. Data format settings include ASCII or binary, 7- or 8-bit characters, 1 or 2 stop bits, and parity selection subject to the published restriction at 19200 bps.
3. Can ACM12 be installed together with ACF11?
No. The specified module arrangement states that ACM12 and ACF11 cannot be combined. ACM11 can be combined with ACM12.
4. What should be investigated if subsystem communication fails?
Check the configured communication settings, cable path, connected equipment and applicable subsystem communication package. A communication interruption alone does not establish that the module itself has failed.
5. What information is useful when requesting an ACM12 quotation?
Provide the ACM12 part number, quantity, destination, required date and machine/system model. A clear photo of the installed module label can also help with part identification.
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