
IEC61131 User and Reference Manual
April 22, 2008
protinfo
Protocol status
Description
The protinfo function block provides diagnostic data about a specific serial port. The status
information is written to integer variables. The integer variables are updated continuously
with data concerning the protocol status of the serial port.
Arguments
Communication port to read protocol status. Valid
values are 1 to 4.
Event counters are cleared when TRUE.
Event counters accumulate when FALSE.
Protocol command errors are the number of received
messages containing an unsupported Modbus
function code. This is also the number of otherwise
valid commands that are rejected because of a
controller lock.
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