- Vibration Monitoring
- PLC & I/O Cards
- Industrial Communications
- Automation Accessories
- Controllers & Data Acquisition
- AC Drives
- Isolator & Barrier
- Industrial Computers
- Encoders
- Safety Switches & Guard Locking
- Automation Software
- HMI Displays
- Motor Soft Starters
- Servo Drives
- CCTV & Security
- Robotics
- Pneumatic Cylinders
- Machine Vision
PLC & I/O Cards
PLC and I/O cards are the processors and input/output modules that read field signals and drive actuators in a control system. Seven Star LLC supplies PLC CPUs, I/O modules, interface modules and safety controller parts to plants and system integrators in Oman. The listing includes Siemens SIMATIC S7-1200 CPUs and ET 200 remote I/O, Allen-Bradley ControlLogix and SLC 500 modules, HIMA safety system modules, Yokogawa CENTUM I/O modules, and Schneider Electric Modicon, ABB S800 and AC500-S, Omron and ICS Triplex hardware.
Read more about PLC & I/O Cards 
Category guide
About PLC & I/O Cards
PLC and I/O cards are the processors and input/output modules that read field signals and drive actuators in a control system. Seven Star LLC supplies PLC CPUs, I/O modules, interface modules and safety controller parts to plants and system integrators in Oman. The listing includes Siemens SIMATIC S7-1200 CPUs and ET 200 remote I/O, Allen-Bradley ControlLogix and SLC 500 modules, HIMA safety system modules, Yokogawa CENTUM I/O modules, and Schneider Electric Modicon, ABB S800 and AC500-S, Omron and ICS Triplex hardware.
PLC, DCS and safety system modules in this category
The modules fall into four types. CPUs and controllers execute the program, from compact units such as the Siemens CPU 1214C to rack-based controllers such as the Allen-Bradley ControlLogix 5580. Digital and analog I/O modules connect switches, transmitters, solenoids and control valves, either in the main rack or in remote I/O stations such as SIMATIC ET 200SP and ET 200M, Modicon TM3 and ABB S800 I/O. Interface and communication modules link racks, remote stations and serial networks. Safety modules, from HIMA, ICS Triplex and the ABB AC500-S family, are used in emergency shutdown, burner management and fire and gas systems and carry certification to IEC 61508. DCS I/O, such as the Yokogawa CENTUM VP digital input module, is listed here as well.
How to select a replacement PLC module
The catalog number has to match completely, including suffix letters. Beyond that, check the series or hardware revision and the firmware version, because a controller project is configured for a firmware level and a newer CPU may need a firmware change or a project update. For I/O, confirm the signal type and range, the number of channels, isolation, diagnostics and the terminal block or base unit, which is often a separate order item. For safety modules, the replacement must be of the version covered by the system certificate and the safety manual. Conformal-coated and extended-temperature variants have their own numbers and are often specified for outdoor shelters in the GCC.
Data needed for a PLC and I/O quotation
Send the full catalog number, series and firmware where shown, quantity, and the rack or system the module belongs to. A photo of the side label is enough. We check the number against the manufacturer documentation and propose the manufacturer’s successor when a module is obsolete.
What to include in your inquiry
These details let us quote the right item the first time.
- Full part number or order code
- Hardware and firmware revision, when replacing a part
- Control system or PLC family it must work with
- New installation or replacement of an obsolete part
- Quantity and required delivery date
Missing some of them? Send what you have. A nameplate photo or an old part number is enough to start.
Top brands in PLC & I/O Cards
All brands →
Related categories
- Vibration Monitoring161
- Industrial Communications98
- Automation Accessories73
- Controllers & Data Acquisition62
- AC Drives54
- Isolator & Barrier19
- Industrial Computers15
- Encoders14
- Safety Switches & Guard Locking12
- Automation Software9
- HMI Displays8
- Motor Soft Starters8
- Servo Drives5
- Robotics4
- CCTV & Security4
- Pneumatic Cylinders2
Most viewed in PLC & I/O Cards
Request a Quote for PLC & I/O Cards
Looking for a specific model, part number or brand in PLC & I/O Cards? Send us your requirements and quantities. Seven Star LLC sources genuine industrial equipment for customers across Oman and the GCC and replies with a formal quotation.
- Genuine OEM products
- Supply across Oman & the GCC
- Formal quotation from our sales team
Free, no-obligation quotation · takes about 1 minute
Other enquiries: [email protected] · WhatsApp
Frequently Asked Questions
Does the firmware version matter when I replace a PLC CPU?
Yes. The project in the engineering software is configured for a specific firmware version or range. A replacement CPU with newer firmware usually needs the hardware configuration updated, or the CPU firmware changed to the version in the project, where the manufacturer allows it. Note the firmware on the old CPU label or in the diagnostics buffer and include it in your inquiry.
What is the difference between standard and safety I/O modules?
Safety I/O modules have redundant internal channels, continuous self-testing, and outputs that go to a defined safe state on a detected fault. They are certified for use up to a stated SIL under IEC 61508 and are engineered with a safety program and a safety protocol. Standard modules have none of this and must not be used in a safety instrumented function.
Can I still get modules for an older platform such as SLC 500 or ET 200M?
Many modules for mature platforms remain obtainable, and each manufacturer publishes a lifecycle status and a recommended successor for discontinued items. Send the catalog number and we check its status in the manufacturer documentation. If it has been withdrawn, we propose the named successor and tell you what else changes, for example a different terminal block, base unit or software version.
Are terminal blocks and base units included with an I/O module?
Frequently not. On many remote I/O systems the electronic module, the base unit or terminal module, and the front connector are separate catalog items, so that modules can be swapped without disturbing the wiring. When replacing a failed module you normally need the electronics only. For a new station, list all three. We check the combination against the manufacturer's configuration rules.
What should I include in an inquiry for PLC or I/O cards?
The complete manufacturer catalog number for each module, the series letter or hardware revision, the firmware version for CPUs and communication modules, the quantity, and the platform it is used in. Mention if you need conformal coating or a safety-rated version. If the number is unreadable, send photos of the label and the front of the module.