QLSAMBAN – Siemens APACS / QUADLOG Standard Analog Module (ROM 3.0)

Overview

The Siemens QLSAMBAN (Moore) is a Standard Analog I/O Module (SAM) for legacy APACS+ and QUADLOG control systems, running ROM version 3.0. Its spare part reference is 16133-79/5, and the module supports both voltage (-10 to +10 V) and current (4-20 mA) analog input/output signals across 8 channels, giving it broader signal-type flexibility than the current-only 39SAMCAN module in the same product family.

Seven Star LLC supplies tested Siemens APACS+/QUADLOG analog modules, including the QLSAMBAN, to plants across Oman and the GCC keeping legacy process control systems running without a full platform migration.

Operating Principle

The QLSAMBAN processes both voltage and current analog signals across 8 channels, converting field-side signals into the digital values the APACS+/QUADLOG processor uses for control and data acquisition. Its sampling rate of up to approximately 500 Hz (roughly 2 ms per sample) and accuracy of about ±0.1% of full scale support process loops where fast, precise analog conversion matters, not just basic on/off status.

Operating from a 24 VDC supply with a maximum draw of 1.1 A, the module plugs directly into the existing APACS+/QUADLOG rack backplane, drawing power and communicating over the rack’s M-BUS without requiring separate wiring beyond the field signal connections themselves.

Engineering Design of the QLSAMBAN

At approximately 30.5 x 5.1 x 27.9 cm and 1.94 kg, the module is built to the standard APACS+/QUADLOG rack card dimensions, carrying ABS-approved industrial quality certification and an operating temperature range of -25°C to +60°C (maximum ambient 70°C) suited to typical control room and cabinet environments. Its 8-channel capacity gives it higher I/O density per slot than modules limited to fewer channels, which matters when rack space is constrained on an aging installation.

As legacy Siemens/Moore stock, the module is available as new, open-box, or refurbished units with supplier warranties (commonly around 12 months), reflecting the platform’s discontinued status and continued reliance on tested secondary-market inventory for exact-fit spares.

Key Features

• Standard Analog I/O Module for APACS+/QUADLOG racks
• ROM version 3.0 firmware
• Supports both voltage (±10 V) and current (4-20 mA) signals
• 8-channel analog I/O capacity
• Sampling rate up to ~500 Hz, accuracy ~±0.1% FS
• 24 VDC supply, maximum 1.1 A draw
• ABS-approved industrial quality certification
• Operating temperature -25°C to +60°C (70°C max ambient)

Industrial Applications

The QLSAMBAN is used as a direct-fit spare or replacement analog I/O module in legacy Siemens APACS+ and QUADLOG process control racks installed in oil and gas, petrochemical, power generation, and water and wastewater treatment systems, particularly where mixed voltage and current signal types need to be handled from a single module. Its higher channel density also suits racks where slot space for additional analog modules is limited.

Across Oman, Muscat, Sohar, Salalah, and the GCC, Seven Star LLC supports plants running legacy APACS+/QUADLOG systems as a supplier of tested analog I/O spare modules, helping engineering teams maintain precise analog signal processing without a full-system replacement.

Technical Specifications

Request a Quote for QLSAMBAN – Siemens APACS / QUADLOG Standard Analog Module (ROM 3.0)

Contact Seven Star LLC for availability, and technical support on the Siemens QLSAMBAN Standard Analog Module and other APACS+/QUADLOG legacy spare parts across Oman and the GCC.

Identifying the Correct Module

Legacy APACS+ and QUADLOG racks can contain several similar-looking analog modules, so identification should be done carefully before ordering:

• Read the full model designation and the spare part number (16133-79/5 for this module) from the module label
• Note the ROM version, since the firmware revision can matter for compatibility with the existing controller and configuration
• Record the rack and slot position and the signal type on each channel (voltage or current)
• Compare the module with the system configuration records to confirm that a like-for-like replacement is required

Photographs of the label and the front of the installed module are the quickest way for our team to confirm a match.

Replacement and Commissioning

Follow the plant procedures for working on a live control system and put the affected loops in manual or bypass before removing the module. Check that the replacement has the same ROM version, or that a different version has been approved for the system. After insertion, confirm that the controller recognises the module without diagnostic alarms, then check each channel with a calibrated source, for voltage and 4-20 mA signals alike, and compare the values shown on the operator station.

Maintenance and Troubleshooting

When a channel reads wrongly, start with the field side: check the terminations, loop wiring, shielding and the field device itself before suspecting the module. Keep the cabinet temperature within the rated range, as heat is a common cause of electronics ageing in older control rooms. Holding a tested spare Siemens QLSAMBAN module allows a faulty unit to be replaced during a short intervention while the root cause is investigated.

Legacy Systems in Oman and the GCC

Many plants in the region still run APACS+ and QUADLOG systems that were installed decades ago. Where a migration is planned but not yet scheduled, a stock of exact-fit spares is the practical way to keep the system available.

Sourcing from Seven Star LLC

Seven Star LLC sources tested APACS+/QUADLOG modules for plants in Oman and the GCC. Send the part number, ROM version and label photographs, and we will confirm condition options and lead time before quotation.

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