Specifications

Process Images Appendix
Quick Start Guide for the MELSEC STlite Series A - 9
STL-DA4-V2 (ID number 51205039)
The analog output module STL-DA4-V2 (four channels, -10 to 10 V) requires 16-bit data and 8 status
bits per channel.
The digitalized output value is transmitted in a data word (16 bits) as output byte 0 (low) and output
byte 1 (high) via the process image of the head station. This value is represented with a 12 bit reso-
lution on the bits b3 to b14. Bit b15 serves as sign bit. The three least significant bits (b0 to b2) are not
parsed.
Negative voltages are output when the output value is specified in two’s complement binary form.
Some fieldbus systems can process status information by means of a status byte. As the returned sta-
tus byte of this output module is always zero, it will not be parsed.
X: Not relevant
NOTE
Although the bits b0 to b2 are not relevant, they can be used for the ease of programming (see
table below). The resulting output error will only be marginal.
Fig. A-12: Process image of the analog output module STL-DA4-V2
Output
[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
Output value X X X
-10 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 8001 H -32767 00 H
-8 1 0 0 1 1 0 0 1 1 0 0 1 1 0 1 0 999A H -26214 00 H
-6 1 0 1 1 0 0 1 1 0 0 1 1 0 1 0 0 B334 H -19660 00 H
-4 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 1 CCCD H -13107 00 H
-2 1 1 1 0 0 1 1 0 0 1 1 0 0 1 1 1 E667 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 1 1999 H 6553 00 H
4 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 3333 H 13107 00 H
6 0 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 4CCC H 19660 00 H
8 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 6666 H 26214 00 H
10 0 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 7FFC H 32767 00 H
Tab. A-8: Process values and corresponding output values for the STL-DA4-V2
b15 b14 b13 b12 b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0
Output byte 1
XXX0/10/10/10/10/10/10/10/10/10/10/10/1Sign
Output byte 0
X: Not used