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Ethernet and serial (RS232C, RS485, USB) ports
N o t e
Timeout value
PLC response timeout
Multiframe originator
timeout
128
However, in certain applications or workarounds, you may have to adapt
the timeout values, e.g. for very slow, fluctuating or instable network
connections (e.g. GPRS) between client and FP Web-Server or between FP
Web-Server and PLC.
The parameter PLC_TMO=AAA in the CHIP.INI file (see appropriate FP Web
Configurator project folder) controls the communication timeout between
FP Web-Server and PLC. PLC_TMO=AAA is in the section [MEW] of the
CHIP.INI file.
Use a text editor such as Notepad to change the CHIP.INI file. Otherwise
FP Web Configurator may not be able to read the file.
The PLC_TMO parameter default value AAA is set to 3. The value AAA is the
basis of two different timeout values:
Description
After the FP Web-Server has sent out a MEWTOCOL request to the PLC, the
PLC must respond within AAA seconds. Otherwise an error is returned to the
originator of the MEWTOCOL request. The originator can be any of the FP
Web-Server functions that need to get/set PLC data: Http server (Web page
data); email client (R20 polling); MEWTOCOL server (FPWIN-Pro, Java
applets ...); Modbus-TCP functions; IEC60870 interface, etc.
Note: The default 3s need only be changed if a very slow communication
system is used between FP Web-Server and PLC.
In case of a running MEWTOCOL multiframe communication (PLC program
download), the FP Web-Server waits up to BBB seconds between the
multiframe data packets. If a multiframe data packet does not follow within
BBB seconds, the multiframe communication is aborted, i.e. the FP
Web-Server assumes that the originator (FPWIN Pro) died and will send no
additional multiframe packets.
Calculation of BBB:
FP Web Configurator < V2.16: BBB = AAA x 2 seconds (default BBB=6s)
FP Web Configurator ³ V2.16: BBB = AAA x 3 seconds (default BBB=9s)
Note
The multiframe timeout needs to be changed only if multiframe data
packets are delayed, e.g. if a GPRS/UMTS communication system is used
for PLC program download and the receiver gets a weak signal.
If the FP Web-Server multiframe timeout needs to be increased, the
following timeouts must also be adapted:
- PLC multiframe timeout system register no. 31
- Response timeout of the originator (FPWIN Pro communication timeout)
FP Web-Server V2.810 EN
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