Interface Submodules
13-48 S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07
13.7.9 Analog Input Function

Analog Input Function

Tables 13-41 ad 13-42 contain an overview of the read and write registers for the

analog input function.

The data format of analog input values is a 16-bit value in two’s complement. You

can see the representation of the digitized measured value in Table 13-43.

Table 13-41 Meaning of the Input Bits in the Analog Input Function (IF 961-AIO)
Offset
Address D15 Reading D0 Remark
00H215 214 213 212 211 210 29282726252423222120ADC data
channel 0
02H215 214 213 212 211 210 29282726252423222120ADC data
channel 1
04H215 214 213 212 211 210 29282726252423222120ADC data
channel 2
06H215 214 213 212 211 210 29282726252423222120ADC data
channel 3
08HA
C
I
N
T0 0 0 0 0 0 0 0 0 0 0 ta ta ta Control register 1
0AH0 0 0 0 0 0 0 0 0 0 0 0 0 ADC
channel no. Control register 2
0CH0 0 0 0 0 0 0 0 0 0 0 0 0 0 P
F
E
O
C
Status register
ADC
ta = 000
ta = 001
ta = 010
ta = 011
ta = 100
INT
AC = 1
ADC channel no.
ADC = 001
ADC = 010
ADC = 011
ADC = 100
PF = 1
EOC = 1
5.7 ms cycle time of the automatic conversion function
2.8 ms
1.3 ms
600 µs
185 µs
Interrupt enable, INT = 0 = not enabled, INT = 1 = enabled
Automatic conversion of all ADC channels active
Number of the selected ADC channel (in the case of conversion on request)
(individual encoding)
Channel 0
Channel 1
Channel 2
Channel 3
Power failure, no external voltage
End of conversion, end of the analog-digital conversion of the selected channel