Flag Operation In Program Controlled Communication - Panasonic FP Series Programming Manual

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In this example the function is programmed in ladder diagram (LD). The same POU header is used

for all programming languages.

All input and output variables used for programming this function have been declared in the POU

22.4.3 Flag operation in program controlled communication

Program controlled communication provides for half duplex communication, i.e. communication is possible in

both directions, but not simultaneously. Sending can be controlled by the "transmission done" flag. Reception

can be controlled by the "reception done" flag or by directly evaluating the receive buffer.

The flags are special internal relays which turn to TRUE or to FALSE under specific conditions. They can be

evaluated using special functions or system variables.

Specification of slot number (high byte) and port number (low byte)

of the MCU to which the data is transmitted.

16#xx01: COM1 on MCU in slot 16#xx

16#xx02: COM2 on MCU in slot 16#xx

Starting address of the receive buffer

Ending address of the receive buffer

for an instant

Data transfer via communication ports

 the specified address using the index

modifier exceeds a limit

 the MCU unit does not exist in the

specified slot

 the specified communication port does

dec. or hex.