531X303MCPBBG1 F31X303MCPA00200 module card

the Master's Modbus packet contains the data byte and data word counts that have NOT been doubled from the amount specified by Reg Count due to the Float Flag set to N. The Slave looks for the byte count in the data packet to know the length of the data to read from the wire. Because of insufficient byte count, some slaves will read only half the data from the Master's transmission. Other slaves will read all 8 bytes in this example because they will know where in the packet the data starts and ignore the byte count parameter inside the Modbus packet.

This field defines whether the command

 is to be executed and under what conditions. If the parameter is set to 0, the command is disabled and will not be executed in the normal polling sequence. Setting the parameter to a value of 1 for the command causes the command to be executed each scan of the command list if the Poll Interval Time is set to zero. If the Poll Interval time is set, the command will be executed, when the interval timer expires. If the parameter is set to 2, the command will execute only if the internal data associated with the command changes. This value is valid only for write commands.

A value of 3 can be used to enable a write 

command continuously (similar to enable code of 1), but if the float flag and float start parameters are being used, the module will only send out a standard 16 bit write. Only valid for FC 6, and 16 when the MB Address in Device >= Float Start Parameter and Float Flag is set to Yes. A value of 4 will provide the same disabling of floating point writes as the enable code of 3, but utilizing conditional writes (similar to enable code 2 functionality). Important: Not all revisions of the MCM driver support this parameter. To determine if your module supports this parameter, contact ProSoft Technical Support.

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