Controllers & HMI
HMI / Operator Panels
Touch and keypad operator panels for monitoring and controlling machines and processes.
- StandardIEC 61131-2 (typical EMC/environment), IEC 60529 (front IP)
Automation
Controllers & HMI
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Product list
Controllers & HMI
PLC (Programmable Logic Controller)
Programmable controllers that run machine and process logic, with digital, analogue and communication I/O.
- StandardIEC 61131
Automation
Controllers & HMI
Remote I/O Modules
Distributed input/output modules that extend a controller across the plant over a fieldbus or Ethernet.
- StandardIEC 61131-2
Automation
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Controllers & HMI from SKE Bharat
This category covers the control layer of an automation system: PLCs that run the logic, HMI operator panels that let operators see and change the process, and remote I/O modules that bring field signals to the controller over a network. They go into machine control panels, pump stations, utilities, packaging lines and process skids.
Controller size follows the I/O count and the work to be done. A compact PLC with built-in I/O suits a single machine. A modular rack suits a plant section with analog loops, PID control, motion or many communication ports. Remote I/O is worth considering once field devices are spread over tens of metres, because one network cable replaces many multicore runs. On the HMI side, screen size and resolution matter less than the clarity of the screens you design, alarms that operators can act on, and trend displays of the critical variables.
When you prepare an enquiry, list:
- Digital and analog I/O counts, with signal types (24 V DC, 4-20 mA, PT100, thermocouple).
- Program memory, scan time and any PID, motion, high-speed counter or data logging needs.
- Communication ports and protocols: Modbus RTU/TCP, Profibus, Profinet, EtherNet/IP, and the number of devices.
- HMI screen size, touch or key operation, and need for recipes, alarms and historical trends.
- Operating temperature and panel mounting conditions.
Controllers need a clean 24 V DC supply, so size one from the range of sensors and power supplies, and match the controller to the drives it commands.
Frequently asked questions
What is the difference between an HMI and a SCADA system?
An HMI is a local operator interface, usually a panel mounted on one machine or panel. SCADA is a supervisory system, running on a computer or server, that collects data from many controllers across a plant, stores history, and provides alarms and reports. A plant can have both: HMIs at machines and SCADA in the control room.
How do I select a PLC?
Count the digital and analog inputs and outputs, add spare capacity, and note special functions such as PID, motion, high-speed counting and communication. Choose a platform with enough memory, scan speed and expansion room, and one your maintenance team can support. List the protocols needed to talk to drives, meters and SCADA.
Which programming languages do PLCs use?
The IEC 61131-3 standard defines ladder diagram, function block diagram, structured text, instruction list and sequential function chart. Ladder is most common on the shop floor, and structured text suits calculations and data handling. Most PLCs support more than one language, but check the language support of the programming software.
When should I use remote I/O instead of a larger PLC?
Use remote I/O when sensors and actuators are spread across a big machine or plant area, so signals can be collected locally and sent over one communication cable. It saves cable and wiring labour and makes troubleshooting easier. A larger PLC is better when everything is in one panel and the network adds no value.
What details are needed to quote a PLC or HMI?
Send the I/O list with signal types, communication protocols, program size expectations, HMI screen size and special functions, plus the supply voltage and panel conditions. If you already have a controller family in the plant, mention it, because compatibility with spares and software is often a deciding factor.