Brand: Siemens

16137-151 – Siemens APACS+/QUADLOG M-BUS Side A Cable (4 M)

Name: Siemens 16137-151 M-BUS Cable (4M) | Seven Star LLC
Brand: Siemens

Description

Overview

The Siemens 16137-151 is a OEM M-BUS Side A interconnect cable for Siemens APACS+ and QUADLOG distributed control systems, supplied at an extended 4-meter length. It serves the same module-to-processor M-BUS communication function as the shorter 2.5-meter M-BUS cables in the product family, but is sized for rack configurations where cabinets are spaced further apart than the standard layout.

Seven Star LLC supplies tested Siemens APACS+/QUADLOG legacy cables, including the 4-meter 16137-151, 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 carries communication between individual control modules and the system processor, distinct from the I/O BUS, which carries data between I/O modules — the two bus types use similar-looking connectors but are not interchangeable. This cable connects the Side A path of a redundant M-BUS pair, and its extended 4-meter length accommodates installations where the physical distance between rack sections exceeds what a standard 2.5-meter cable can reach.

Choosing the correct cable length matters on this type of interconnect: a cable that is too short cannot be forced to reach across a longer rack gap, and selecting the 4-meter variant where the standard 2.5-meter length is actually needed leaves excess cable that must be managed within the cabinet.

Engineering Design of the 16137-151

The 16137-151 is manufactured to the same OEM electrical specification as the shorter M-BUS cables in the family, differing only in physical length to suit extended rack layouts. As genuine legacy Siemens stock, it is supplied pre-owned or surplus and tested functional prior to shipment, consistent with the platform’s discontinued status and the resulting reliance on tested secondary-market stock.

Because M-BUS communication underpins the processor’s ongoing visibility into module status, sourcing the correctly identified length — not just any M-BUS cable — is part of restoring proper system communication rather than merely filling a physical connector.

Key Features

Genuine Siemens OEM M-BUS Side A interconnect
4-meter length for extended rack-to-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
Same OEM electrical specification as the standard 2.5m M-BUS cable
Maintains legacy system operation without a full upgrade
Compatible with existing APACS+/QUADLOG rack wiring

Industrial Applications

The 16137-151 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, specifically in rack layouts where cabinets are spaced beyond standard reach. It is a direct-fit spare for restoring the extended M-BUS Side A path after a cable fault or during a planned cabinet 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 in the lengths their installed rack layouts actually require.

Technical Specifications

Model	Siemens 16137-151
Cable Type	M-BUS, Side A
Length	4 meters
System Compatibility	Siemens APACS+ / QUADLOG racks
Condition	Pre-owned/surplus, tested functional
Lifecycle	Discontinued by Siemens, supplied as legacy spare

Request a Quote for 16137-151 – Siemens APACS+/QUADLOG M-BUS Side A Cable (4 M)

Contact Seven Star LLC for a quotation, availability, and technical support on the Siemens 16137-151 M-BUS Side A Cable (4m) and other APACS+/QUADLOG legacy spare parts across Oman and the GCC.

Confirming the Correct Cable

APACS+ and QUADLOG cabinets use several cable types that look alike, so identification should be done from the part number rather than the connector shape. The part number is normally printed on a label or sleeve near one of the connectors. Check it together with the bus it serves (M-BUS rather than I/O BUS), the side of the redundant pair (Side A or Side B), and the measured length between the two connection points in the cabinet. If the label is missing, trace the cable from the processor end and compare it with the cabinet drawings and the system configuration records before ordering.

Part number and revision, if marked
Bus function: M-BUS or I/O BUS
Redundancy side: A or B
Required routed length, including bends and cable tray paths

Replacement and Commissioning Practice

In a redundant M-BUS, one side can usually be serviced while the other keeps the system running, but the work should still be planned under a permit and with the operations team informed. Confirm from the system diagnostics that Side B is healthy before disconnecting Side A. Handle connectors with antistatic precautions, keep the pins clean, and route the new cable along the same path with the original bend radius and strain relief. After reconnection, check the system diagnostics to confirm that both sides of the bus are healthy and that no communication alarms remain.

Troubleshooting Tips

Intermittent communication alarms on one side often come from loose or partly seated connectors, bent pins, or cable damage near cabinet doors and moving parts. Reseat the connectors first, inspect the cable along its route, and compare the alarm history with any recent work in the cabinet. If a fault moves with the cable when it is swapped, the cable itself is the likely cause.

Supporting Legacy Systems in the GCC

Many refineries, gas plants and utilities in Oman and the wider Gulf still depend on legacy control and safety platforms. Keeping critical spares such as the Siemens 16137-151 on site shortens repair time and reduces dependence on long lead times. Seven Star LLC helps maintenance teams build practical spares lists for these systems and sources tested legacy parts, with the part number confirmed before dispatch.

Other Models in the Siemens APACS+ / QUADLOG Components Range

Seven Star LLC supplies models from the Siemens APACS+ / QUADLOG Components range in Oman and the GCC. Compare the related models below and request a quote for the one that matches your application.

Model	Category
Siemens Moore APACS P/N: 16137-175	Automation Accessories	View details
16137-151 – Siemens APACS+/QUADLOG M-BUS Side A Cable (4 M)	Controllers & Data Acquisition	You are viewing this model
16137-222 – Siemens APACS+/QUADLOG M-BUS A Side Cable (2.5 M)	Controllers & Data Acquisition	View details
16137-223 – Siemens APACS+/QUADLOG M-BUS B Side Cable (2.5 M)	Controllers & Data Acquisition	View details
16137-153 – Siemens ModuleBus Cable B-Side (4 M) for APACS+/QUADLOG	Controllers & Data Acquisition	View details
16137-224 – Siemens APACS+/QUADLOG I/O BUS A Side Cable (2.5 M)	Controllers & Data Acquisition	View details
16137-225 – Siemens APACS+/QUADLOG I/O BUS B Cable (2.5 M)	Automation Accessories	View details
Siemens APACS ModulNET Interface PC Card (P/N 16413-15, old PN 16267-1)	Industrial Communications	View details
16413-1-1 / 16413-1-5 – Siemens APACS MBI/NMI PCI Card	Industrial Communications	View details

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About brand

Most Siemens automation parts are bought by article number, the string beginning 6ES7, 6AV2 or 6GK5 printed on every module. Founded in 1847 and headquartered in Munich, Siemens builds the SIMATIC controllers, SCALANCE networks and SINAMICS drives that plant engineers meet on almost every site.

Seven Star LLC, an independent supplier, lists Siemens PLC and I/O modules, HMI panels, industrial Ethernet switches, drives, protection relays, temperature transmitters and gas analyzer spare parts for projects in Oman and the GCC.

Siemens product families on this page

Controller hardware covers the SIMATIC S7-1200 (CPU 1214C with SM 1223 signal modules) and the S7-1500 (CPU 1515-2 PN), with ET 200SP and ET 200M distributed I/O and their IM 155-6 and IM 153-2 interface modules. Operator panels include the KTP700 Basic and TP700 Comfort. SCALANCE XC208 managed switches handle industrial Ethernet. Drives are represented by the SINAMICS G120C compact inverter and the G120X for pumps and fans. From the power side come the SIPROTEC 7SJ85 feeder protection relay and SIVACON S8 switchboards, and from process instrumentation the SITRANS TH320 head-mounted temperature transmitter.

Where Siemens equipment is used

SIMATIC controllers and ET 200 I/O run packaged units, skids and whole process lines in water treatment, oil and gas, cement, food and manufacturing plants. SINAMICS drives control pumps, fans and conveyors, SCALANCE switches form the control network, and SIPROTEC relays protect medium voltage feeders and motors.

Ordering Siemens parts: what we need

Send the complete article number, the functional status or version printed on the module and, for CPUs, the firmware version your project was written for. For drives add power, supply voltage, filter option and fieldbus version. For SIPROTEC relays the long order number or product code is required, because it fixes the hardware and function package. A nameplate photo answers most of these points at once.