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Rules Governing the Use of the S5-115F
10.11.4 Checking Analog Input Modules Using Check Analog Output Modules
The operating system must check non-intermittent analog input modules to establish whether or
not they are capable of reading in two configured check values properly. A check AQ module
generates these check signals. The AI and check AQ modules must have the same measuring
range.
The check AQ module can be connected to either subunit A or B. If you connect several AI modules
to one check AQ module, the AI modules must have the same signal group number.
The process limit values from which a safety-related action is to be derived must be defined and
configured as check values (
switched to the relevant analog inputs. The values read in must agree with the check values.
Note
You can derive safety-related actions only from these check values.
You require four interposing relays per analog input channel. The relays of a relay DQ module can
be used for this purpose.
If you use single-channel sensors, you can connect the check relay DQ module either to subunit A
or B.
If you use two-channel sensors, you must connect the interposing relays diagonally to the two sub-
units.
Note
Analog sensors can be either single-channel or two-channel, but only require one
check analog output module.
10.11.5 Type 16 Analog Input Modules
Type 16 analog input modules have the following characteristics:
•
Safety-related
•
Intermittent input signal
•
They are plugged into subunits A and B (two-channel configuration) and must have the same
address in both subunits.
10-46
Vol. 2, 1.2.3 of the Manual). In the test, the check values are
S5-115F Manual
EWA 4NEB 811 6148-02
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