Description

Yokogawa ACG10S-F2121 Communication Gateway Unit

Configured for V net to Ethernet protocol conversion in Yokogawa CENTUM distributed control systems, the Yokogawa ACG10S-F2121 (ACG10S Communication Gateway Unit) provides deterministic data routing between redundant 10BASE-5 coaxial segments and wide-area Ethernet infrastructure.

Suffix Breakdown & Model Matrix

Code Segment	Code	Technical Meaning
Model	ACG10S	Communication Gateway Unit
Suffix 1	-F	Frame Mode, Wide Area Communication (Ethernet)
Suffix 2	2	Dual-Redundant V net Interface (10BASE-5)
Suffix 3	1	General-Purpose 19-inch Rack Mountable Type
Suffix 4	1	100–120 V AC Power Supply
Suffix 5	2	Basic Software License for CENTUM VP (LGW12)
Suffix 6	1	Style Code (Hardware Revision Variant)

Hardware Specifications

Parameter	Specification
Brand	Yokogawa
Origin	Japan
Weight (Rack Mount)	7.5 kg
Weight (Desktop)	6.5 kg
Dimensions	19-inch rack width, depth standardized for DCS cabinet integration
Operating Temp	0 to 50 degC
Power Consumption	100–120 VAC, 50/60 Hz

Foundation Fieldbus & 4-20 mA Loop Considerations

The ACG10S-F2121 supports deterministic V net packet scheduling for process control loops requiring fixed latency. When interfacing with 4-20 mA HART field instruments via connected FCS nodes, channel-to-channel isolation must be maintained at the I/O subsystem level to prevent ground loop interference. Cold junction compensation is executed within downstream analog input modules rather than the gateway itself. Profibus PA and Foundation Fieldbus segments require independent linking devices; the ACG10S does not perform protocol conversion beyond Ethernet encapsulation.

Frequently Asked Questions

Q: Does the ACG10S-F2121 support hot-swapping while the V net remains active?

A: No. The unit must be powered down prior to removal or insertion to prevent V net token ring disruption.

Q: What is the redundancy switchover behavior during a primary V net failure?

A: The secondary 10BASE-5 interface assumes control without session reset; Ethernet-side TCP sessions may experience transient packet loss.

Q: Is firmware backward compatibility guaranteed with earlier CENTUM CS versions?

A: Compatibility depends strictly on LGW12 license revision matching the installed CENTUM VP version; mismatched firmware prevents network initialization.

Field Installation Guidelines

Install the ACG10S-F2121 only in grounded 19-inch cabinets with vertical clearance allowing coaxial bend radius greater than 50 mm. Terminate 10BASE-5 AUI cables using factory-specified N-type connectors torqued to manufacturer specification. Maintain separation of V net coaxial runs from 100–120 VAC power wiring by a minimum of 150 mm to reduce EMI coupling. Ensure rack grounding conductors are bonded to the facility ground grid with impedance below 1 ohm. Verify power supply phase alignment before energizing redundant AC feeds.

Specifications

• Brand: Yokogawa

Advantages

• High reliability in industrial environments
• Supports continuous operation
• Compatible with major PLC/DCS systems