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S5-95F
11.3
Start-Up of Analog Input Modules
Set the intended operating mode using the switches on the front panel of analog input modules.
These switches are located on the right side at the top of the front panel of the module.
Power supply
Set the switch to the available power supply frequency. This selects the inte-
frequency:
gration time of the A/D converters for optimal interference voltage suppression.
Power frequency 50 Hz:
Power frequency 60 Hz:
Operation:
Set the number of channels you wish to assign on the input module. If there are
fewer than four channels, less address space will be assigned and measured values
will be updated faster.
Broken wire:
Once the broken wire signal has been activated, a break on one of the lines to the
sensor (thermocouple or PT 100) or of the sensor itself causes the red LED above
the function selection switch to light up. At the same time, the broken wire error
bit F (bit 1, byte 1) for the faulty channel is set.
The module " recognizes" a wire break by applying a conventional tripping current
to the input terminals and by comparing the resulting voltage to a limit value. If
there is a wire break in the sensor or the lines, the voltage exceeds the limit value
and a "wire break" signal is sent. When the signal at the input is measured with a
digital voltmeter, the tripping current pulses cause apparent fluctuations of the
signal. Deactivation of the wire break signal does not turn off the tripping current.
Table 11-1. Operating Mode Switch Settings for Analog Input Modules 464-8M.11
Function
Power supply
frequency
Operation
Wire break
EWA 4NEB 812 6210-02
Integration time 20 ms
Integration time 16.66 ms
Settings for Operating Mode Switch
50 Hz
4
3
2
1
1 channel
2 channels (channel 0
(channel 0)
4
3
2
1
With wire break signal
4
3
2
1
Analog Value Processing
4 channels (channel 0
and channel 1)
4
3
2
1
No wire break signal
60 Hz
4
3
2
1
- channel 3)
4
3
2
1
4
3
2
1
11-5
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