5X00241G01 Analog output card

The addressed Slave responds with its address and the function code followed by the information field. The information field contains 1 byte describing the quantity of data bytes to be returned. The contents of the registers requested (DATA) are 2 bytes each, with the binary content right justified within each pair of characters. The first byte includes the high order bits and the second, the low order bits. Because the Slave interface is normally serviced at the end of the controller's scan, the data will reflect the register content at the end of the scan. Each PC will limit the quantity of register contents provided each scan; thus for large register quantities, multiple PC scans will be required, and the data provided will be form sequential scans. In the example below the register 3009 contains the decimal value 0.

Force Single Coil

This message forces a single coil either ON or OFF. Any coil that exists within the controller can be forced to either state (ON or OFF). However, because the controller is actively scanning, unless the coil is disabled, the controller can also alter the state of the coil. Coils are numbered from zero (coil 0001 = zero, coil 0002 = one, and so on). The data value 65,280 (FF00 HEX) will set the coil ON and the value zero will turn it OFF; all other values are illegal and will not affect that coil. The use of Slave address 00 (Broadcast Mode) will force all attached Slaves to modify the desired coil. Note: Functions 5, 6, 15, and 16 are the only messages that will be recognized as valid for broadcast.

The forcing of a coil via MODBUS function 5

 will be accomplished regardless of whether the addressed coil is disabled or not (In ProSoft products, the coil is only affected if the necessary ladder logic is implemented). Note: The Modbus protocol does not include standard functions for testing or changing the DISABLE state of discrete inputs or outputs. Where applicable, this may be accomplished via device specific Program commands (In ProSoft products, this is only accomplished through ladder logic programming). Coils that are reprogrammed in the controller logic program are not automatically cleared upon power up. Thus, if such a coil is set ON by function Code 5 and (even months later), an output is connected to that coil, the output will be "hot".

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