Siemens Simatic S7-200 System Manual page 391

Figure A-38 shows the Connector Terminal Identification for EM232 Analog Output AQ 2 x 12
Bits.
VLoad
ANALOG
OUTPUT-PS
Figure A-38
AQ 2 x 12 Bits
Output Data Word Format
Figure A-39 shows where the 12-bit data value is placed within the analog output word of the
CPU.
MSB
15
AQW XX
MSB
15
AQW XX
Figure A-39
Note
The 12 bits of the digital-to-analog converter (DAC) readings are left-justified in the output
data word format. The MSB is the sign bit: zero indicates a positive data word value. The
four trailing zeros are truncated before being loaded into the DAC registers. These bits
have no effect on the output signal value.
S7-200 Programmable Controller System Manual
C79000-G7076-C230-02
ILoad
V0 I0 M V1 I1
Connector Terminal Identification for Expansion Module EM232 Analog Output
14
0 Data value 11 Bits
Current output data format
Data value 12 Bits
Voltage output data format
Output Data Word Format
S7-200 Data Sheets
24V
M
EXTF
LSB
4 3 0
0 0 0 0
LSB
4 3 0
0 0 0 0
-
+
L+ M
EM232
AQ 2 x 12 Bit
Bipolar
(voltage mode)
Bipolar
(current mode)
A-67