Description

Yokogawa AKB161-M100 Signal Cables

The Yokogawa AKB161-M100, also cataloged as the AKB161 Signal Cable, operates as a dedicated hardware component for RS-422/RS-485 serial communication between ALM-side M4 terminals and subsystem M3 terminals within Yokogawa CENTUM VP and ProSafe-RS networks.

Hardware Specifications

Parameter	Specification
ModelBrand	Yokogawa AKB161
Origin	Japan
Dimensions	Cable length: 100 m (max); crimp terminal sizes: M4/M3
OperatingTemp	-20 to 70 degC
PowerConsumption	N/A (passive cable)
CableType	RS-422/RS-485 multi-pair shielded
Termination	M4 screws (ALM side), M3 screws (subsystem side)
CommunicationProtocols	Modbus RTU/ASCII, FA-M3, MELSEC, SLC500

Process Control Connectivity

The cable design ensures channel-to-channel isolation to reduce interference between RS-422/RS-485 pairs across long runs. Shielding minimizes electromagnetic interference (EMI) in industrial environments. The M4-to-M3 asymmetric terminal configuration guarantees correct physical alignment with Yokogawa modules and peripheral devices. This cable can operate in conjunction with 4-20 mA HART loops or FOUNDATION Fieldbus/ProfibusPA-connected networks when integrated into Yokogawa DCS and SIS architectures.

Frequently Asked Questions

Q: Can the AKB161-M100 be used beyond 100 m?
A: Cable length is limited to 100 m per Yokogawa specification. Exceeding this may cause signal degradation.

Q: Is the cable hot-swappable on ALR121 modules?
A: No, disconnection while the system is active may lead to communication errors.

Q: How should the shielding be grounded?
A: Connect shielding to a single-point ground at the module end to reduce EMI without creating ground loops.

Field Installation Guidelines

• Route cables away from high-power conductors to minimize inductive interference.
• Maintain twisted-pair integrity; avoid untwisting more than 5 mm at termination points.
• Use M4 screws for ALR121 module terminals and M3 screws for external device terminals; ensure proper torque per industrial electrical standards.
• Verify shield continuity along the cable run; avoid sharp bends that may compromise shielding or conductor insulation.
• For runs exceeding 50 m, verify signal integrity with a loopback test before commissioning.

Specifications

• Brand: Yokogawa

Advantages

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