H-S81-HS Installation & Operation Manual — P/N LS10114-000HI-E:A 2/24/2015 127
Notes on I/O Module Redundancy Application Notes
6.4.1 I/O Module Redundancy
I/O module redundancy means the possibility to connect a field user to two modules at the same
time. Therefore, redundancy in this document refers to I/O modules only, and not to field devices.
With respect to this, we would remind that complete redundancy (modules + field devices) is possi-
ble for all I/O modules without restrictions. The I/O modules of the H-S81-HS system can be
divided into two categories:
• Redundancy not possible
• Redundancy possible, with restrictions
6.4.2 I/O Modules for Which Redundancy is Not Possible
Redundancy is not possible for these modules:
6.4.3 I/O Modules for Which Redundancy is Possible With
Restrictions
Redundancy is possible for the modules below, with some restrictions or precautions:
S81-F3002-2 Module with 8 safety related monitored inputs
These modules can be redundant, even though with the following restrictions:
• To isolate an input line, both channels connected to that line shall be isolated.
• In the supervisory system, each sensor shall be represented by two different items.
• Modules shall be placed on adjacent racks and in the same position.
• Duplicated channels shall be configured in the same way.
S81-F4001-2, S81-F4002-2, S81-F4003-2 4-20mA safety related modules
These modules can be redundant, even though with the following restrictions:
• To isolate an input line, both channels connected to that line shall be isolated.
• In the supervisory system, each sensor shall be represented by two different items.
• Modules shall be placed on adjacent racks and in the same position.
• Duplicated channels shall be configured in the same way.
S81-F5001 S81-F5004-2 Safety related output modules
These modules can be redundant, even though with the following restrictions:
• To isolate an output line, both channels connected to that line shall be isolated.
• In the supervisory system, each actuator shall be represented by two different items.
• Modules shall be placed on adjacent racks and in the same position.
• Duplicated channels shall be configured in the same way.
• S81-F5002-1
Module with 16 non monitored outputs
• S81-F5003-1
Module with 8 monitored outputs with polarity reversal for audible alarm devices
• S81-F6001-1
Control module for fire extinguishing systems
• S81-F6002-1
Logic module
• S81-F7002-1
ESP protocol control module
• S81-F7006-1
Modbus RTU Master/Slave module
1
1 The module S81-F7006 cannot be duplicated, but features two independent communi-
cation lines, one RS485 and one RS232; therefore, the communication to the DCS can
be considered redundant.
• S81-F7007-1
SSP protocol control module
• S81-F7008-1
Control module for scales
• S81-F7009-1
Apollo protocol control module
• S81-F7010-1
System Sensor protocol control module
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