Analog Value Representation - Siemens SINUMERIK 840D sl Equipment Manual

Checkback signal of the operating modes
The set operating modes are saved in the input image in Status Byte 0. This value must be
compared with Control Byte 0 in the output image. If these are different, an error has occurred,
e.g. in the case of overvoltage in the "Temperature measurement" operating mode,
see Diagnostics via input image (Page 143).
9.3.5.3

Analog value representation

Note
The analog values of the inputs and outputs are written or read in 16 bit data format i.e. they
must be accessed word by word.
The analog values are provided as 16 bit integer values. Depending on the operating mode, the
measured values must be converted using the following factors in order to achieve the
corresponding physical value.
Factor (AI):
Factor (AO):
Calculation: 16 bit value (hex. or dec.) * factor = measured value
Analog inputs
Table 9-57
16 bit value (hex.)
Overflow
Overrange
0x19B5
0x0CDA
0x066D
0x0000
0xF993
0xF326
0xE64B
Underrange
Underflow
Table 9-58
16 bit value (hex.)
Overflow
Overrange
NCU 7x0.3B PN
Equipment Manual, 10/2020, 6FC5397-1EP40-6BA1
Voltage [V]
0.00152
0.00038
Measured values in the voltage measurement operating mode
16 bit value (dec.)
6581
3291
1645
0
-1645
-3291
-6581
Measured values in the current measurement operating mode
16 bit value (dec.)
Current [mA]
0.00305
0.00076
Factor
-
-
0.00152
-
-
Factor
-
-
Connectable components
9.3 PP 72/48D 2/2A PN
Temperature [°C]
0.1
-
Voltage value [V]
Deactivation
Up to 11.75 V
10 V
5 V
2.5 V
0 V
-2.5 V
-5 V
-10 V
Up to -11.75 V
Deactivation
Current value [V]
Deactivation
Up to 23.5 mA
141