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6.7
Application case 3a: SIL3/Cat.4/PLe, 2- or 4-wire transmitter, 1oo2
(high availability)
Definition
In the following, you can find the wiring diagram and the configuration of the I/O module F-AI
8xI 2-/4-wire HART HA for the application case 3a:
• SIL3/Cat.4/PLe
• 1oo2 evaluation
• Redundant I/O module
• Application for a two-channel or for two single-channel qualified sensors
You can find possible diagnostic messages, their causes and remedies in the "Diagnostic
messages" section.
Wiring
You perform the wiring on the appropriate terminal block. You can find additional information
on this in the section "Terminal assignment (Page 17)".
Sensor supply
The sensor supply can be powered internally (2‑wire transmitter) or externally (4‑wire
transmitter).
Wiring scheme
Refer to application case 1a or 2a.
One of these application cases is set up in pairs.
It is recommended to pair the following inputs for the 1oo2 evaluation in the CPU:
• Channel 0 and 4
• Channel 1 and 5
• Channel 2 and 6
• Channel 3 and 7
You can combine the channels for the 1oo2 evaluation in the CPU as you like. However, the
mentioned combinations represent the most favorable channel pairings, because these channel
pairs are read in simultaneously by the F-module and therefore you can set the lowest possible
discrepancy time.
In the following figure, application case 1a and channels 0 and 4 have selected as an example.
F-AI 8xI 2-/4-wire HART HA
Equipment Manual, 09/2021, A5E50557845-AA
6.7 Application case 3a: SIL3/Cat.4/PLe, 2- or 4-wire transmitter, 1oo2 (high availability)
Applications of the F-I/O module
51
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