Siemens S7-300 - Page 248

Analog modules
9.3 SM 336; F-AI 6 x 0/4 ... 20 mA HART
Fail-safe signal modules
248 Installation and Operating Manual, 01/2010, A5E00085586-10
Assignable parameters for application 5
Table 9- 19 Parameters for application 5 of SM 336; F-AI 6 x 0/4 ... 20 mA HART
Parameters Range of values in safety mode Type Effective range
Diagnostic interrupt Activated/deactivated Static Module
Behavior after channel
fault
Passivate the entire
module/Passivate the channel
Static Module
HART_Gate Off/On/Can be switched Static Module
Interference frequency
suppression
50 Hz/60 Hz Static Module
Evaluation of the sensors 1oo2 evaluation* Static Channel
Measuring range 4 to 20 mA, 0 to 20 mA Static Channel
F-wire break detection activated/deactivated
(in the 4 to 20 mA measuring range)
Static Channel
Smoothing 1 / 4 / 16 / 64 conversion cycles Static Channel
Discrepancy time (ms) 0 to 30000 Static Channel
Tolerance window (%)
absolute
0.2 to 20 Static Channel
Tolerance window (%)
relative
0.2 to 20 Static Channel
Standard value MAX/MIN Static Channel
HART function Activated/deactivated Static Channel
HART repetitions 0 to 255 Static Channel
HART group diagnostics Activated/deactivated Static Channel
* If you are evaluating sensors in your safety program (e.g., in S7 F Systems using F-block
F_1oo2AI), configure "1oo1 evaluation".
Discrepancy analysis for fail-safe analog input modules
If you have configured 1oo2 evaluation, you can configure a discrepancy time and an
absolute and a relative tolerance window for each channel pair of the 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 redundant input channels of the channel pair exists longer
than the configured discrepancy time, an 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
. In S7 F/FH Systems the fail-safe value assigned at the input
SUBS_V of the channel driver will be provided in the PII.