Moeller PS 416-BGT-4 Series, Hardware And Engineering, Page: 123 / 150

Direct Communication with
Data Terminal Units via the
COM Function Block
120
02/98 AWB 27-1208-GB
Starting a job A job is started by generating a rising edge on the
appropriate Strobe input (TransmitStrobe/
ReceiveStrobe). The input parameters are accepted
with the next invocation of the COM function block,
and a plausibility test is carried out. Invalid
parameters are indicated on the “TransmitError” or
“ReceiveError” function block outputs.
The Strobe input is edge-triggered. A subsequent job
can only be started if the input has been “0” for at
least one program cycle. The ReSet signal must
be “0”.
Sending data
Figure 46: Sending data
햲
The COM function block is invoked and accepts the “1”
signal on its TransmitStrobe input. It reads all function
block parameter inputs and carries out a plausibility
check.
햳
The COM function block acknowledges the sent job
with TransmitActive = 1 if hardware and parameter
settings are error-free. The data is then sent.
햴
The COM function block is invoked with the “0” signal
on the TransmitStrobe input after the
acknowledgement is complete. This is a pre-requisite
for a subsequent send job.
햵
The data block was sent and therefore the job is
completed. The COM function block indicates this
when it is invoked by resetting the TransmitActive flag.
햶
A new send job can be started if there are no errors
(TransmitError = 0). Proceed as per
햲
.
TransmitStrobe
TransmitActive
햲
햳
햶
햵
햴
햳
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