Adding I/O to an existing PLC without changing the program
When new signals can bypass the PLC, when its program has to change, and which Ethernet I/O, fieldbus I/O and gateways fit each case.
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Application guides for ICP DAS I/O, controllers, gateways and meters, sorted by the job they do.
ICP DAS makes the building blocks of measurement and control systems: remote I/O modules, programmable automation controllers (PACs), protocol gateways, power meters, sensors and IIoT edge devices. Most of them use open protocols such as Modbus RTU, Modbus TCP, MQTT and OPC UA, so they combine with each other and with PLCs, SCADA, building management systems and cloud platforms from other vendors.
The pages below are organised by application rather than by product line. Each one describes what a typical system in that area needs, which ICP DAS product groups fit, and what to check before you choose hardware. Articles with worked examples and selection guides are added to each area over time.
When new signals can bypass the PLC, when its program has to change, and which Ethernet I/O, fieldbus I/O and gateways fit each case.
How PMC and PMD concentrators poll power meters, log to microSD, resend data after network outages and deliver it over Modbus TCP, MQTT, SNMP or FTP.
How to connect an unmanned site over 4G: outgoing connections or VPN, power, alarms, buffering when offline, and which ICP DAS devices fit.
How MQTT and OPC UA differ in communication model, data description and security, and which ICP DAS devices support each protocol.
Sensing cable or spot probe, how to divide a room into zones, and how to route leak and cable-break alarms to staff, BMS and SCADA.
How demand is measured, how to build staged load-shedding rules on a PMC or PMD concentrator, and a worked example with relay outputs.
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