GE IS220PPRAS1A Digital I/O card

The 2301D-ST control is programmed to function as a slave unit only. As a slave unit, the 2301D-ST will only respond to a transaction request by a master device. The 2301D-ST can directly communicate with a DCS or other Modbus supporting device on a single communications link, or through a multi-dropped network. If multi-dropping is used

up to 246 devices (2301D-STs or other customer devices) can be connected to one Master device on a single network. The control address is programmed under the 2301D-ST’s communications block Each message to or from a master has a defined structure called the message “frame”. A frame consists of the slave device address, a code defining the requested data and error checking information The Modbus function code tells the addressed slaves what function to perform. The following table lists the function codes supported by this control.

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