16137-222 – Siemens APACS+/QUADLOG M-BUS A Side Cable (2.5 M)

Overview

The Siemens 16137-222 is a genuine OEM M-BUS Side A interconnect cable for Siemens APACS+ and QUADLOG distributed control systems, supplied at a 2.5-meter length. It carries ModuleBus (M-BUS) communication — the module-to-processor link distinct from the I/O BUS — between rack sections on the A side of the system’s redundant M-BUS path.

Seven Star LLC supplies tested Siemens APACS+/QUADLOG legacy cables, including the 16137-222, to plants across Oman and the GCC maintaining installed control and safety systems without a full platform migration.

Function Within the System

The M-BUS in an APACS+/QUADLOG rack handles communication between individual control modules and the system processor, a different function from the I/O BUS, which carries data between I/O modules. Both bus types typically run as redundant A/B pairs for fault tolerance, but a cable designed for one bus type will not properly restore communication if installed on the other, even though the physical connectors can appear similar.

The Side A designation identifies this cable as the primary path in the redundant M-BUS pair; the corresponding Side B cable (16137-223) completes the redundant connection at the same 2.5-meter length.

Engineering Design of the 16137-222

At 2.5 meters, the cable is sized for standard rack-to-rack spacing within a single APACS+/QUADLOG cabinet. As genuine legacy Siemens stock, it is supplied pre-owned or surplus and tested functional prior to shipment, reflecting the platform’s discontinued status and the resulting reliance on tested secondary-market stock for exact-fit spares.

Because M-BUS communication underpins the processor’s ability to reach individual control modules, a faulty or missing M-BUS cable can affect module visibility and control response in ways that are more immediately disruptive than an I/O BUS fault on the same rack — making correct identification of this cable type important when sourcing a replacement.

Key Features

• Genuine Siemens OEM M-BUS Side A interconnect
• 2.5-meter length for standard intra-cabinet rack spacing
• Carries module-to-processor communication on the M-BUS
• Distinct bus function from I/O BUS cables in the same system
• Tested functional prior to shipment
• Supports redundant A/B bus architecture when paired with Side B
• Maintains legacy system operation without a full upgrade
• Compatible with existing APACS+/QUADLOG rack wiring

Industrial Applications

The 16137-222 is used to maintain or repair M-BUS connectivity in legacy Siemens APACS+ distributed control systems and QUADLOG safety systems installed in oil and gas, power generation, petrochemical, and water and wastewater treatment facilities. It is a direct-fit spare for restoring the M-BUS Side A path after a cable fault or during a planned rack reconfiguration.

Across Oman, Muscat, Sohar, Salalah, and the GCC, Seven Star LLC supports plants running legacy APACS+/QUADLOG systems as a supplier of tested spare interconnect cables, helping engineering teams keep installed control racks fully communicating with their processors.

Technical Specifications

Request a Quote for 16137-222 – Siemens APACS+/QUADLOG M-BUS A Side Cable (2.5 M)

Contact Seven Star LLC for pricing, availability, and technical support on the Siemens 16137-222 M-BUS Side A Cable and other APACS+/QUADLOG legacy spare parts across Oman and the GCC.

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