18
•
750-563 [2 AO 0/4-20mA / 6-18V DC 16 Bit]
Function
Description
WAGO-I/O-SYSTEM
750
I/O
Modules
2.1.1.8.3 Step 3 – Y
2
Conversion of the Data Format
In this step, the value Y
1
determined through the configured data format is
converted into the DAC format, leading sign-less 16 bit integer. The context
of the conversion is described below:
Integer without
leading sign
Integer with leading
sign
Integer with leading
sign bit
DAC format
0 -32768
undefined 0
1 -32767
-32767 1
... ... ... ...
32768 0
0 32768
... ... ... ...
65535 +32767 +32767 65535
2.1.1.8.4 Step 4 – Y
3
Limit Control
The limit control monitors whether the value Y
2
in DAC format is in the
desired value range. This value range is defined by the parameter underrange
limit value (UNR) and the overrange limit value (OVR). Via bit 7 of the
register 32, it is also possible to activate a limit of the value Y
3
to this range.
During the determination of the calibration values for the manufacturer or user
calibration, no limit should be placed. You can achieve this by configuring the
overrange and underrange limit values to the maximum or minimum value
(65535 or 0) or by writing a 0 to bit 7 of register 32.
Configuration of the overrun limit
Register Name
Description
41
Underrange limit value
42
Overrange limit value
If you would like to set the limits to defined analog output values, then these
must be determined either like the calibration values in step 5 or calculated
from these.
