Internet PLC Forum

General => Technical support => Topic started by: marius on March 01, 2002, 04:02:10 AM

Title: Slow communicatin
Post by: marius on March 01, 2002, 04:02:10 AM

We used an EXOR control panel and a TD888+
The EXOR is setted to work at 9600, 8, N, 1
Same the PLC. The protocol is Modbus RTU and the time-out is setted at 5 s and number of retry is 2
There are some delay between pushing the knob and the start the hydraulics.
Have you any idea about how can we improve the speed?

Thx
Marius

Title: Re: Slow communicatin
Post by: support on March 01, 2002, 09:46:14 AM

Try to  play around with the delay time between messages and the tolerance to errors. There should be some configuration settings that allow you to change the delay between messages when a communication message either pass or fail, that should improve the speed of response vastly.

You may also want to use the SETPROTCOL command to set the PLC to MODBUS RTU only protocol. This ensure that the PLC is already waiting for the RTU command and will respond more quickly to the first message. The PLC supports 5 different protocol and when in auto mode it uses the first successfully received command to configure itself to a certain protocol. If no command have been received after 10 second, it sets itself back into auto mode again.