2
015-
08
28
Segment Protector
Operation
Additionally, ELS–1 issues a visual alarm to help identify the affected device/housing or
validate the error.
5.6
Using Device Couplers in PROFIBUS PA Installations
You need to take special precautions for installations operating under the following conditions:
■
With a high level of environmental impact
■
With vibration or shock
■
With field devices connecting or disconnecting regularly during operational conditions
The following precautions are necessary to decrease consecutive failures that cause a
PROFIBUS PA segment to fail:
■
Regularly check that the terminal connections of the device coupler are tightened
correctly
■
Increase the RETRY LIMIT parameter of the PROFIBUS master to a minimum of 4
Note: When using the Fuchs Segment Coupler HD2-GT* series, the default
value of the RETRY LIMIT is already set to 4.
■
In order to disconnect a field device, ensure to adhere to the following sequence:
1. Unplug the corresponding connector at the device coupler
2. Unscrew the fieldbus wires at the field device
5.7
Using Device Couplers in FOUNDATION Fieldbus H1 Installations
You need to take special precautions for installations operating under the following conditions:
■
With a high level of environmental impact
■
With vibration or shock
■
With field devices connecting or disconnecting regularly during operational conditions
The following precautions are necessary to decrease consecutive failures that cause a
FOUNDATION Fieldbus H1 segment to fail:
■
Regularly check that the terminal connections of the device coupler are tightened
correctly
■
Increase the STALE_COUNT_LIMIT parameter of the FOUNDATION Fieldbus LAS or
host used to a minimum of 2
■
In order to disconnect a field device, ensure to adhere to the following sequence:
1. Unplug the corresponding connector at the device coupler
2. Unscrew the fieldbus wires at the field device
