Specifications

Appendix Process Images
A - 4
MITSUBISHI ELECTRIC
STL-AD4-V2 (ID number 51205050)
The four-channel analog input module STL-AD4-V2 (for voltages from -10 V 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. Bit b15 is set when the measured
value is negative. Both bits b0 and b1 are set in case of measurement range overflow or underflow.
X: Not used; UV: Measuring range underflow, OV: Measuring range overflow
* In this cases the ERROR-LED of the corresponding channel is lit.
Fig. A-7: Process image of the analog input module STL-AD4-V2
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
Measured value X UV/OV
<-10 1 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 8003 H -32765 41 H *
-10 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 8000 H -32768 00 H
-8 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 0 9998 H -26214 00 H
-6 1 0 1 1 0 0 1 1 0 0 1 1 0 X 0 0 B334 H -19660 00 H
-4 1 1 0 0 1 1 0 0 1 1 0 0 1 X 0 0 CCCC H -13107 00 H
-2 1 1 1 0 0 1 1 0 0 1 1 0 0 X 0 0 E664 H -6552 00 H
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0000 H 0 00 H
2 0 0 0 1 1 0 0 1 1 0 0 1 1 0 0 0 1998 H 6552 00 H
4 0 0 1 1 0 0 1 1 0 0 1 1 0 0 0 0 3330 H 13104 00 H
6 0 1 0 0 1 1 0 0 1 1 0 0 1 X 0 0 4CCC H 19660 00 H
8 0 1 1 0 0 1 1 0 0 1 1 0 0 0 0 0 6660 H 26208 00 H
10 0 1 1 1 1 1 1 1 1 1 1 1 1 X 0 0 7FFC H 32764 00 H
>10 0 1 1 1 1 1 1 1 1 1 1 1 1 X 1 1 7FFF H 32767 42 H *
Tab. A-3: Input values and corresponding process values for the STL-AD4-V2
b15 b14 b13 b12 b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0
Input byte 1
UV
OV
X0/10/10/10/10/10/10/10/10/10/10/10/1Sign
Input byte 0
X: Not used
UV: Measuring range underflow
OV: Measuring range overflow
UV
OV