Specifications

Appendix Process Images
A - 2
MITSUBISHI ELECTRIC
A.1.4 Analog Input Modules
STL-AD2-V (ID number 51205046)
The two-channel analog input module STL-AD2-V (for voltages from 0 to 10 V) transmits a 16-bit
measured value and 8 status bits per channel. Accessing the status byte depends on the fieldbus sys-
tem being used.
The digitalized measured value is transmitted in a data word (16 bits) as input byte 0 (low) and input
byte 1 (high) into the process image of the head station/controller.
This value is represented with a 12 bit resolution on bit b3 to b14. The least significant bit b0 is set (1)
when the range of measurement is overranged.
X: Not used; OV: Measuring range overflow
Fig. A-5: Process image of the analog input module STL-AD2-V
NOTE The representation of the process data of some I/O modules in the process image depends on the
fieldbus head station used.
Please take this information as well as the particular design of the respective control/status bytes
included in the description concerning the process image of the corresponding head station.
Input
[V]
Numerical value
Status
byte
(Hex.)
Binary
Hexa-
decimal
Decimal15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
X Measured value X X OV
<0.00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0000 H 0 00 H
0.00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0000 H 0 00 H
1.25 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 1000 H 4096 00 H
2.50 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 2000 H 8192 00 H
3.75 0 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 3000 H 12288 00 H
5.00 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 4000 H 16384 00 H
6.25 0 1 0 1 0 0 0 0 0 0 0 0 0 0 0 0 5000 H 20480 00 H
7.50 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 6000 H 24576 00 H
8.75 0 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 7000 H 28672 00 H
10.00 0 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 7FF8 H 32760 00 H
>10.00 0 1 1 1 1 1 1 1 1 1 1 1 1 0 0 1 7FF9 H 32761 42 H
Tab. A-1: Input values and corresponding process values for the STL-AD2-V
b15 b14 b13 b12 b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0
Input byte 1
OVXX0/10/10/10/10/10/10/10/10/10/10/10/1X
Input byte 0
X: Not used
OV: Measuring range overflow