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S5-115F Manual
10.10.4 Checking Digital Output Modules Using Readback Digital Input Modules
A safety-related digital output module must be checked by a two-channel readback digital input
module. The 115F operating system compares both input signals and reports an error when they
are not identical. Error handling is described in Chapter 10 ( 10.6). This type of checking does not
depend on whether the output signal is intermittent or not.
The readback input channels are assigned diagonally to the two subunits.
The bit numbers of the output channel and the readback input channel must be identical.
10.11
Analog Input Modules
When configuring the I/O modules (
each AI according to the characteristics of the process signals. There are four different analog
input types. Only I/O types 14 to 16 are permissible for safety-related use.
Requirements to be met by sensors with current outputs
It must be possible to interrupt sensors that have current outputs for I/O types 14 and 15. This is
because of the supplementary test carried out by the operating system of the 115F as follows:
•
Disconnection of the sensors from the AI module
•
Connection of the test AQ to the AI module
•
Test
•
Disconnection of the test AQ from the AI module
•
Connection of the sensors to the AI module
Note
Please ensure that the "short discrepancy time for analog inputs" configured by you
with COM 115F is greater than the settling time of your current signal sensors.
460 AI module
The 460 AI module is only permissible for nonsafety-related analog inputs.
463 AI module
The 463 AI module has four input ranges
•
4 to 20 mA with wire-break monitoring by live zero
•
0 to 20 mA
•
0 to 1 V
•
0 to 10 V
Non-intermittent analog input signal (I/O types 14 and 15)
You can only use those input ranges that have an output range identical to that of the test
AQ 470. These are as follows:
•
4 to 20 mA with wire-break monitoring by live zero
For this purpose, only channel Type 4 (4 mA=0 units), and not channel Type 3
(4 mA=256 units), may be configured.
•
0 to 20 mA
•
0 to 10 V
EWA 4NEB 811 6148-02
Rules Governing the Use of the S5-115F
Vol. 2 of the Manual), you must define the I/O type for
10-37
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