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Configuration
28 S1A53844 01/2011
Configuration of the communication interruption
Configure the Modbus time out
A communication detected fault (Err5 and Err8) is triggered if the Altivar 212 does not receive any valid
Modbus requests at its address within a predefined time period (time out) set in the [Com. time out] (F803)
parameter. The timer starts when the communication has been established for the first time (valid frame, drive
address matches). Any Modbus request function is taken into account to reactivated the timer (read, write and
identification).
Access to the parameter
This parameter is accessible in the [COMMUNICATION MENU] COM submenu of [PROGRAMMING MENU]
Programming mode.
Description
Monitoring the Modbus communication status
Modbus communication status are displayed in Monitoring mode. This parameter enables to check the
modbus communication on RJ45 and OpenStyle port.
On the embedded display terminal
On the graphic display terminal
Parameter Modbus
address
Setting Unit Default
setting
Valid
after
[Com. time out] (F803)
Communication time out
2051
16#803
0: Communication detection disabled
1 ... 100: 1 to 100 seconds
s 3 Setting
WARNING
LOSS OF CONTROL
• If F803 is set to 0, communication control will be inhibited.
• For safety reasons, inhibiting the communication interruption detection should be restricted to the debug
phase or to special applications.
Failure to follow these instructions can result in death, serious injury, or equipment damage.
Display
example
Display on graphic
display option
Description
Mb
[Mdb com stat]
Modbus
communication status
Without Communication
Example: With Communication on RJ45 port
ON:
OFF:
OpenStyle Tx
OpenStyle Rx
RJ45 Tx
RJ45 Rx
Mdb com stat
RJ45 B - A - COM
Rx Tx Rx Tx
Rem Loc/Rem
RJ45:
Mb activity on RJ45 port
When Rx and/or Tx are
displayed in this row
their state is inactive
B-A-COM:
Mb activity
on OpenStyle port
Switch between local to remote
mode using the F4 button on the
display terminal
Mdb com stat
RJ45 B - A - COM
Tx Rx Tx
Rx
Rem Loc/Rem
Mdb com stat
RJ45 B - A - COM
Rx Rx Tx
Tx
Rem Loc/Rem