R. Stahl introduces a new version of the IS1 remote I/O system for hazardous areas, which can communicate via Modbus TCP and thereby qualifies for Industrial Ethernet environments. The protocol itself lacks standardised configuration, parameterisation and diagnosis mechanisms, but a DTM makes IS1 systems compatible with standard software packages such as Pactware, Fieldcare, Fieldmate etc. Many users have, of course, long been fa-miliar with the proven Modbus protocol. Its Ethernet-capable version was chosen because of its highly efficient data transfer, its very easy implementation and operation and its suitability for redundant structures. Moreover, Modbus TCP is supported by almost all control systems, e.g. Emerson Delta V or Yokogawa Centum CS.
The Ethernet-adapted IS1 version features a modified CPU & Power Module (IS1 CPM). It now consists of two separate components: a Communication Unit (CPU) with inner workings similar to a PC and a Power Module (PM). Both components remain hot swappable, i.e. they can be exchanged separately during operation in zone 1.
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