CAN-CBX-AI420 - esd electronics, Inc.

64
Device Profile Area
8.8.3 Read Input 16-Bit (6401 h)
Index
[Hex]
6401
Subindex
[Dec]
Description
Value range
[Hex]
Default
[Dec]
Data type R/W
0 number_of_entries 4 4 unsigned 8 ro
1 Read_Analogue_Input_16_1 8000...7FFF - signed 16 ro
2 Read_Analogue_Input_16_2 8000...7FFF - signed 16 ro
3 Read_Analogue_Input_16_3 8000...7FFF - signed 16 ro
4 Read_Analogue_Input_16_4 8000...7FFF - signed 16 ro
Assignment of the variable Read_Analogue_Input_16_x (x = 1...4):
The last digit of the name of the variable is the number of the respective analogue input channel. The
16 higher-order bits of the A/D-converters are used in two’s complement representation. The values
of the variables result from the measured values corrected by averaging, offset and gain and if necessary
addition.
Calculation of the measured voltage at default setting of the objects:
In the default-setting of the objects a calculation of the moving average of the last 32 measurement
values (see object 2403 h, page 77) is made, before object 6401 h is updated. The value range is:
Value of the variable Read_Analogue_Input_16_x
Binary (bit 15...0)
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Hexadecimal
measured voltage
1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 8000 -10.00 V
: : : : : : : : : : : : : : : : : :
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 FFFF -0.3052 mV
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0000 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0001 +0.3052 mV
: : : : : : : : : : : : : : : : : :
0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 7FFF
Resolution of the measured values:
1 LSB based on the variable Read_Analogue_Input_16_x (x = 1...4):
1 LSB VARIABLE => 10 V / 8000 h => 0.3052 mV
+10.0 V - (1 LSB VARIABLE)
= 9.99969 V
CAN-CBX-AI420 Manual Rev. 1.3