"Select debug line" (16615)
Indication
Meaning
16620
Debug line
is READ
This output is TRUE (LED is green), if the selected Debug line command was a read,
otherwise FALSE. It is FALSE too if "Select debug line" set to 0.
Modbus Slave Devices 1-5 timeouts:
The LED s of LM variables "08.72 Modbus dev.1 timeout" to "08.76 Modbus dev.5 timeout"
inform about time outs of the corresponding slave devices.
Timeouts can happen e.g. in this cases:
• The slave is not answering at all
•
• The slave is answering but in a rate slower than defined in the mapping file. This can
•
happen, when the slave is inherently slow or when the mapping was set up in a way
that too many requests were scheduled in the scheduled rate time.
One Modbus read or write command to one slave will take at least 50 msec. The
minimum permitted rate group is 100 msec. If now a mapping is configured in a way that
it requires more writes to a device than fits into the required rate, or the slave has very
long answer times, there will be a timeout error. The device will still read/write but it will
not do it as quickly as required. This issue can be mitigated by defining slower rate
groups or reducing the number of read/write commands.
823
easYgen-3000XT Series
B37574
6 Application Field
6.5.5.3 Status/diagnostic Modbus master
Released