6 PROTOCOL BLOCK
6.4.3 Configuring the field network tag names
The procedure of configuring field network tag names for Drive devices and AS-I link/AS-I Link Advanced is
slightly different from this procedure. For more information, see Configuring field network devices tag names
for the Drive devices and Configuring field network tag names for the AS-i Link/AS-i Link Advanced devices
If the Data Control Time and Watchdog Control Time are not configured properly, and there is a switchover
initiated, this may result in loss of communication with the slave devices. In such a scenario, you must modify
the Baud Rate, the Watchdog Control Time, and the Data Control Time. The Baud Rate is also dependent on
the number of slave devices configured in the network. In addition, you must select the Override slave
specific Watchdog Control Time check box.
The following table lists the recommended baud rates and their corresponding watchdog control time and data
Watchdog Control Time
For devices that have DP-V1 enabled, the Watchdog Control Time and the Data Control Time must be
three times longer than the actual time when DP-V1 is disabled.
By default, the ET200M devices have DP-V1 enabled.
When you select the Baud Rate as 45.45, the values of the following parameters are updated by default.
Slot Time = 100
Max. Station Delay Time = 60
Setup Time = 1
The Siemens PA coupler supports only the 45.45 BR. Though they support the 45.45 BR, the default values of
the Slot Time, Max. Station Delay Time, and the Setup Time do not enable the coupler to detect the PA
devices. Therefore, when Siemens PA couplers are used, you must modify these values as following:
Slot Time = 640
Max. Station Delay Time = 400
Setup Time = 95
The coupler can detect the PA devices only after modifying these values.
If the Caution
symbol appears against any field, you must click Adjust to update the particular field.
Data Control Time