2
0
1
8
-1
2
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Installation
3.12
Status Monitoring of the Output Shutdown
The I/O module FB1308 allows you to monitor the status of output shutdown.
Configuring I/O modules for status monitoring
Configure the I/O module as a passive voltage input. Disable the channel supply. See the
manual "FB Remote I/O - Software".
3.13
Redundancy in PROFIBUS Communication
3.13.1
Basic Principles
Redundancy is used when it is necessary to guarantee operation of a remote I/O unit despite
one or more components having failed.
In order to build a redundant system, use the backplanes FB9262BP10220.1 and
FB9262BP20220.1. These backplanes provide space for redundant com units, redundant bus
termination modules, and redundant power supplies.
To ensure that the primary com unit and the redundant com unit use the same data record, both
com units must be connected to one another. To do so, connect the com unit via the front
sockets using the com unit cordset. It is possible to tell which com unit is active by looking at the
operating mode LED. If the operating mode LED is flashing, the com unit is active. If the
operating mode LED is not lit, the com unit is passive. For more information about the status
LEDs, refer to the datasheet for the relevant com unit in use.
As a general rule, a distinction is made between media redundancy and application
redundancy. Com units can be set to media redundancy or application redundancy using the
configuration software. For more information, refer to the software manual for the com unit
used.
Danger!
Explosion hazard due to incorrect connection
Improper installation and configuration of the device can cause sparks and other hazards in
potentially explosive atmospheres, which can ignite the surrounding atmosphere.
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If you are using the I/O module for status monitoring, configure the module as a passive
voltage input. Disable the channel supply.
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The circuit for output shutdown is a (non-intrinsically safe) SELV circuit. Disconnect this
circuit from other circuits in accordance with the requirements of explosion protection and
electrical safety.
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Keep the separation distances between the non-intrinsically safe circuit and the
intrinsically safe circuits.
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Note that the module loses its suitability for intrinsic safety in explosion protection once
you connect one or more channels of the module to a non-intrinsically safe circuit.
Note!
Note that both com units in a redundant system must have the same firmware.