Brand: Siemens

16137-225 – Siemens APACS+/QUADLOG I/O BUS B Cable (2.5 M)

Name: Siemens 16137-225 I/O BUS Cable | Seven Star LLC
Brand: Siemens

Description

Overview

The Siemens 16137-225 is a genuine OEM I/O BUS Side B interconnect cable for Siemens APACS+ and QUADLOG distributed control systems, supplied at a 2.5-meter length. It is the redundant partner cable to the I/O BUS Side A path (16137-224), completing the fault-tolerant I/O BUS connection between rack sections when a system is configured for full redundancy.

Seven Star LLC supplies tested Siemens APACS+/QUADLOG legacy cables, including the 16137-225, to plants across Oman and the GCC maintaining installed control and safety systems without a full platform migration.

Function Within the System

In a redundant APACS+/QUADLOG configuration, the I/O BUS runs as two independent physical paths, Side A and Side B, so that a fault on one cable or connector does not interrupt I/O module communication — the system continues operating on the surviving side while the fault is corrected. The Side B cable specifically completes this redundant pair; a system running without both sides properly connected is operating without I/O BUS fault tolerance, even if it appears to function normally under fault-free conditions.

Like its Side A counterpart, the I/O BUS is functionally distinct from the M-BUS in the same rack architecture, carrying I/O module data rather than module-to-processor communication, so the two cable types are not interchangeable even though they share similar physical connectors.

Engineering Design of the 16137-225

At 2.5 meters, the cable matches the standard rack-to-rack spacing used within a single APACS+/QUADLOG cabinet, and is manufactured to the same OEM specification as the Side A cable to ensure identical electrical and mechanical performance on both redundant paths. As legacy Siemens stock, it is supplied pre-owned or surplus and tested functional before shipment, reflecting the platform’s discontinued status.

Replacing a failed Side B cable with a properly identified, tested spare restores the redundant I/O BUS configuration to its designed fault-tolerant state, rather than leaving the system running on a single, unprotected communication path.

Key Features

Genuine Siemens OEM I/O BUS Side B interconnect
2.5-meter length matching the Side A cable for redundant pairing
Completes fault-tolerant I/O BUS communication
Distinct bus function from M-BUS cables in the same system
Tested functional prior to shipment
Identical OEM specification to the Side A cable
Maintains legacy system operation without a full upgrade
Compatible with existing APACS+/QUADLOG rack wiring

Industrial Applications

The 16137-225 is used to restore or maintain redundant I/O 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 specified together with the Side A cable whenever a system’s designed redundancy needs to be fully restored, not just partially functional.

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 maintain full redundancy on their installed control racks.

Technical Specifications

Model	Siemens 16137-225
Cable Type	I/O BUS, Side B
Length	2.5 meters
System Compatibility	Siemens APACS+ / QUADLOG racks
Condition	Pre-owned/surplus, tested functional
Lifecycle	Discontinued by Siemens, supplied as legacy spare

How to Confirm the Right Cable

APACS+ and QUADLOG interconnect cables look similar but differ in bus side and length. Check the part number printed on the cable label or marker sleeve: 16137-225 identifies the I/O BUS Side B cable at 2.5 m, while the Side A partner is 16137-224. Before ordering, confirm the rack positions it connects and measure the route, because a cable that is too short cannot be installed without strain and a longer one needs proper routing and support.

Replacement Procedure

Confirm that the Side A path is healthy and that the system is running on it before disconnecting the Side B cable.
Follow site permit and management of change procedures for work on a control or safety system.
Note the connector positions, disconnect the old cable and inspect the connectors on the rack for bent pins or damage.
Fit the new cable, secure connectors and cable supports, then confirm in system diagnostics that both bus sides are healthy.

Maintenance and Troubleshooting

Intermittent I/O BUS alarms on one side often point to a loose connector, a damaged cable from panel work, or corrosion on contacts. Inspect and reseat connectors during planned outages and keep cables away from sharp edges and hinges. Because the system runs redundantly, a single-side fault may be hidden from operators, so review diagnostics regularly and correct any single-side fault quickly to keep redundancy.

Applications in Oman and the GCC

APACS+ and QUADLOG systems remain in service in some oil and gas, petrochemical and utility facilities in Oman and the GCC. Holding a Siemens 16137-225 spare supports these legacy installations until a planned migration takes place.

Sourcing from Seven Star LLC

Seven Star LLC supplies tested legacy APACS+ and QUADLOG spares and helps maintenance teams confirm part numbers before ordering.

Request a Quote for 16137-225 – Siemens APACS+/QUADLOG I/O BUS B Cable (2.5 M)

Contact Seven Star LLC for availability and technical support on the Siemens 16137-225 I/O BUS Side B Cable and other APACS+/QUADLOG legacy spare parts across Oman and the GCC.

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	View details
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	You are viewing this model
Siemens APACS Communication Module – 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.