Applications of the F-I/O module
5.1 Digital input applications
Digital I/O module F-DI 4+F-DQ 2x24VDC/2A, 4xM12 (6ES7146-5FF00-0BA0)
40
Equipment Manual, V1.0, 05/2021, A5E51082342-AA
The main features of the F-DI 4/F-DQ 2 Fail-Safe module digital inputs include the following
items:
•
Inputs are 24 V DC rated inputs that meet the requirements of IEC 61131-2 as Type 1
inputs.
•
Configure each channel as 1oo1 or part of a 1oo2 channel group. The corresponding
channels (x.0, x.2) and (x.1, x.3) form a 1oo2 channel group. The lower numbered
channel of the group is called the primary input and the other channel is called the
secondary input. Within this restriction, you can assign 1oo1 and 1oo2 in any order.
•
Short-circuit testing requires use of the internal sensor supply. For all evaluation and
sensor interconnections except for 1oo2, 2 channel - 3 wire nonequivalent, use V
S1
with
inputs x.0 to x.1 and V
S2
with inputs x.2 to x.3. For evaluation and sensor interconnection
for 1oo2, 2 channel - 3 wire nonequivalent, use V
S1
with inputs x.0 to x.3, and do not use
V
S2
.
•
If you enable the short-circuit test, you configure both V
S1
and V
S2
with the same
parameters. All channels that you configure for internal sensor supply are subject to the
same short-circuit test. You configure a test duration (length of dark time) and test
interval (time between the start of the dark tests).
•
The module performs these short-circuit functions for F-DI channels:
–
Monitors the sensor supply to detect short-circuit or overload.
–
Cycles the sensor supply once on each power up to assure control and readback are
working. This ensures operational integrity of the sensor supply at power up even
when disabled.
–
Monitors the readback during input short-circuit tests.
•
Configure a discrepancy time to identify unacceptable differences between 1oo2 inputs.
•
Configure a filter time for each channel or each 1oo2 pair.
You can achieve Cat. 3 in 1oo1 configurations if you diagnose external wiring faults or
exclude them according to standards by proper routing, protection, and proof-testing of
conductors:
•
Each F-DI input includes sufficient diagnostics and redundant components such that no
single internal fault can cause a dangerous failure.
•
An appropriately-rated, single sensor can reach Cat. 3 by internal fault tolerance.
•
The external wiring of a single sensor to a single input is vulnerable to single fault
dangerous failures unless you apply additional measures.
You can achieve Cat. 4 in 1oo2 configurations if you diagnose external wiring faults or
exclude them according to standards by proper routing, protection, and proof-testing of
conductors:
•
With 1oo2 evaluation, a pair of F-DI inputs is not subject to dangerous internal failure
within a reasonable number of accumulated internal faults.
•
Appropriately-rated, external-paired sensors or equivalent redundancy can achieve Cat. 4.
•
The duplicated external wiring of two sensors to two input points is vulnerable to
accumulated fault dangerous failure unless you apply additional measures.
The fail-safe digital inputs are certified for SIL 3/PL e only when you select 1oo2 evaluation.
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