Chapter 4 Analog input/output modules Manual VIPA System 200V
4-20 HB97E - SM-AIO - Rev. 12/32
Wire break recognition
Via the bits 0 and 3 of byte 0, the wire break recognition is activated for the
input channels. The wire break recognition is only available for the current
measuring range of 4...20mA and at (thermo) resistance measuring. A wire
break is recognized when the current input during current measuring sinks
under 1.18mA res. when the resistance at (thermo) resistance measuring
reaches infinite. This causes an entry in the diagnosis area and is shown
via the SF-LED.
If a diagnostic interrupt is activated, a diagnosis message is sent to the
super-ordinated system.
Diagnostic interrupt
With the help of bit 6 of byte 0, you may release the diagnostic interrupt. In
case of an error like e.g. wire break, the superordinated system receives
record 0 (4byte). For an extended diagnosis you may then call record 1
(12byte). More detailed information is to find below under "Diagnostic data".
CPU-Stop reaction and replacement value
With bit 4 and 5 of byte 1 and byte 12 ... 15 you may set the reaction of the
module at CPU-Stop for every output channel.
Via byte 12 ... 15 you predefine a replacement value for the output channel
as soon as the CPU switches to Stop.
By setting bit 4 res. 5, the last output value remains in the output at CPU-
Stop. A reset sets the replacement value.
Function-no.
Here you set the function-no. of your measuring res. output function for
every channel. Please see the according table next page.
Meas. cycle
Here you may set the transducer velocity for every input channel. Please
regard that a higher transducer velocity causes a lower resolution because
of the lower integration time.
The data transfer format remains unchanged. Only the lower Bits (LSBs)
are not longer relevant for the analog value.
Structure Meas. cycle Byte:
Byte Bit 7 ... Bit 0 Resolution Default
6 ... 9 Bit 3 ... 0: Velocity per channel
0000 15 conversions/s
0001 30 conversions/s
0010 60 conversions/s
0011 120 conversions/s
0100 170 conversions/s
0101 200 conversions/s
0110 3.7 conversions/s
0111 7.5 conversions/s
Bit 7 ... 4: reserved
16
16
15
14
12
10
16
16
00h
Parameter
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