Technical data

Chapter 6 Analog input modules Manual VIPA System 200V
6-22 HB97E - SM - Rev. 09/19
Diagnostic interrupt
The Diagnostic interrupt is enabled by means of bit 6 of byte 0. In this case
an error a 4byte diagnostic message will be issued to the master system.
Function-no.
Here you have to enter the function number of your measurement function
for every channel. The allocation of the function number to a measurement
function is available from the table above.
Option byte
Here you may specify the conversion rate. In addition selection and
envelope functions have been implemented.
Note!
Please note that the resolution is reduced when conversion rate is increa-
sed due to the shorter integration time.
The format of the data transfer remains the same. The only difference is
that the lower set of bits (LSBs) loose significance for the analog value.
Structure of the option byte:
Byte Bit 7 ... Bit 0 Resolution Default
6 ... 9 Option byte:
Bit 3 ... 0: rate*
0000 15 conversions/s
0001 30 conversions/s
0010 60 conversions/s
0011 123 conversions/s
0100 168 conversions/s
0101 202 conversions/s
0110 3.7 conversions/s
0111 7.5 conversions/s
Bit 5 ... 4: Selection function
00 deactivated
01 use 2 of 3 values
10 use 4 of 6 values
Bit 7 ... 6: Envelope function
00 deactivated
01 envelope ± 8
10 envelope ±16
16
16
15
14
12
10
16
16
00h
*) These specifications apply to 1channel operation. For multi-channel operations, the conversion rate
per channel can be calculated by dividing the specified conversion rate by the number of active
channels.
Parameters