Controllers & Data Acquisition

This category holds controllers and data acquisition hardware that sit outside a standard PLC rack: process controllers, DCS processors and bus components, paperless recorders, telecontrol cards and laboratory control electronics. Seven Star LLC supplies these items to plants, utilities and research laboratories in Oman. The main brands listed are Siemens, Schneider Electric, ABB, Yokogawa, Moore Industries and Thorlabs, with further items from National Instruments, Woodward, JUMO, IDS GmbH and SELTA.

Types of controller and data acquisition equipment listed

Four groups cover most of the listing. Process and loop controllers include panel-mounted units such as the ABB ControlMaster CM30 and controllers from Yokogawa and JUMO, which run PID loops for temperature, pressure, flow or level on a skid or furnace. DCS and high-availability hardware includes the Schneider Electric Foxboro FCP280 field control processor, Siemens SIMATIC S7-400H CPUs, and Siemens APACS+ and QUADLOG modules and bus cables for plants that still run those systems. Recording and acquisition covers the ABB RVG200 paperless recorder and National Instruments hardware. Telecontrol cards and CPUs from IDS GmbH and SELTA serve utility SCADA outstations. A fifth, smaller group is Thorlabs photonics electronics, such as piezo controllers and laser diode drivers with TEC control, used in optical laboratories.

Selecting a controller or data acquisition module

For a loop controller, define the number of loops, the input type (thermocouple, RTD, mA or voltage), the output type (relay, mA or motorized valve drive), the panel cutout size, the supply voltage and the communication protocol. For data acquisition, the deciding points are channel count, signal type, sampling rate, isolation between channels and how the data is stored or transmitted. For DCS and legacy system parts, the exact part number, the ROM or firmware version and the hardware revision matter more than anything else, because a module with a different version may not be accepted by the existing system.

Replacement parts for legacy control systems

Several platforms in this category are no longer in active production, and many operators in the GCC keep them running with replacement modules. We check the part number against the manufacturer documentation, state the version being offered, and propose the manufacturer’s migration path when the original part can no longer be sourced.