New range of low-cost Modbus-based remote I/O modules

These low-cost I/O modules offer good reliability for distributed control applications. They are compact, easy to integrate with existing Modbus networks, and simple to use for end users. Various types of I/O module are available for different kinds of requirements, all with LED indicators for status and fault diagnostics. In addition, the modules have an isolated two-wire RS485 interface. Using the Modbus RTU protocol makes it easy to interface with most SCADA software packages such as DAQFactory.

There are four digital I/O modules: the 16DI has 16 digital inputs, which also double as 32-bit pulse counter inputs; the 16DO has 16 open-collector transistor outputs; the 4RO has four mains-capable power relays; and the 8DIO is a combination unit with eight digital inputs and eight transistor outputs.

The analogue I/O modules include: the 8AIIS and 8VIS accept eight 4-20mA or voltage inputs; the 8TCS accepts eight thermocouples including K, E, T, N, B, S, R, mV, C, D and G types; the 6RTD accepts six three-wire RTD temperature probes; and the 8AOI and 8OV are eight-channel 4-20mA and voltage output models. There is also the DAIO combination unit with two analogue inputs, one analogue output, four digital/counter inputs, two transistor outputs and two RTD inputs.

IOStudio is a free software package supplied with the units to configure the communication settings for I/O modules on the Modbus network. Once a module is detected, it is possible to view real-time data relating to the module directly on a PC and the software can be used for diagnostic purposes too.

Available ex-stock, prices for the modules start at only £99.