Analog modules
9.2 SM 336; AI 6 x 13 Bit
Fail-safe signal modules
Installation and Operating Manual, 01/2010, A5E00085586-10
209
Assignable parameters for application 5
Table 9- 9 Parameters for application 5 of SM 336; AI 6 x 13Bit
Parameters Range of values in safety mode Type Effective range
"Inputs 1" tab
Enable diagnostic
interrupt
Activated/deactivated Static Module
Interference frequency 50 Hz/60 Hz Static Module
Group diagnostics Activated/deactivated static channel
Wire-break check Activated/deactivated Static Channel
Measurement type
Deactivated
4DMU
2DMU
Static Channel
Measuring range 4 to 20 mA Static Channel
"Inputs 2" tab
Safety mode
According to SIL 3
2 sensors
Static Module
Monitoring time 10 ms to 10000 ms static module
Discrepancy time 10 to 10000 ms static module
Tolerance window in
terms of the measuring
range
0 to 20% in 1% increments Static Module
Standard value MIN/MAX Static Module
"Redundancy" tab
Redundancy none Static Module
Discrepancy analysis for fail-safe analog input modules
If you have configured safety mode in accordance with SIL 3, you can configure a
discrepancy time and an absolute tolerance window (as a % of the 4 mA to 20 mA
measuring range) for each input of the analog input module. In addition, configure the
standard value (MIN = lower value / MAX = higher value) to be applied and transferred to the
F-CPU.
If the difference between the two measured values is outside of the tolerance window for
longer than the configured discrepancy time, this error is signaled and the fail-safe value
(7FFF
H
) is transferred. In
S7 Distributed Safety
, the fail-safe value 0 is provided in the PII for
the safety program in place of 7FFF
H
.
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