Specifications

Process Images Appendix
Quick Start Guide for the MELSEC STlite Series A - 7
STL-TI2 (ID number 51205048)
The two-channel analog input module STL-TI2 for temperature acquisition transmits 16-bit measured
values per channel as well as 8 optional status bits to the head station. Accessing the status byte
depends on the fieldbus system being used.
To evaluate the platinum resistance sensors the measured values of the resistance are converted and
sent as temperature values. All temperature values are represented in a standard numeric format.
The possible numerical range matches the defined temperature range of the Pt100 sensors from
-200 °C to +850 °C. The temperature values of the sensors are represented with a resolution of 1 digit
per 0.1 °C within a word (16 bits). Thus, 0.0 °C corresponds to the numeric value 0000
H and 100.0 °C to
03E8
H (decimal 1000). Temperature values below 0 °C are represented in two’s complement binary
form.
* In this cases the red ERROR-LED of the corresponding channel is lit.
Fig. A-10: Process image of analog module STL-TI2 for temperature acquisition
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.
Temperature
[C]
Resistance
[]
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
<-200.0 10.00 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 8001 H -32767 41 H *
-200.0 18.49 1 1 1 1 1 0 0 0 0 0 1 1 0 0 0 0 F830 H -2000 00 H
-100.0 60.25 1 1 1 1 1 1 0 0 0 0 0 1 1 0 0 0 FC18 H -1000 00 H
0.0 100.00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0000 H 0 00 H
100.0 138.50 0 0 0 0 0 0 1 1 0 1 1 1 1 0 0 0 03E8 H 1000 00 H
200.0 175.84 0 0 0 0 0 1 1 1 1 1 0 1 0 0 0 0 07D0 H 2000 00 H
500.0 280.90 0 0 0 1 0 0 1 1 1 0 0 0 1 0 0 0 1388 H 5000 00 H
750.0 360.47 0 0 0 1 1 1 0 1 0 1 0 0 1 1 0 0 1D4C H 7500 00 H
800.0 375.51 0 0 0 1 1 1 1 1 0 1 0 0 0 0 0 0 1F40 H 8000 00 H
850.0 390.26 0 0 1 0 0 0 0 1 0 0 1 1 0 1 0 0
2134 H 8500
00 H
>850.0 >390.26 0 0 1 0 0 0 0 1 0 0 1 1 0 1 0 0 42 H *
Broken wire against R
L
0 0 1 0 0 0 0 1 0 0 1 1 0 1 0 0 42 H *
Tab. A-6: Input values and corresponding process values for the STL-TI2
NOTE The measured value can exceed the range from decimal –2000 to 8500 until the limitation applies.
b15 b14 b13 b12 b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0
Input byte 1
0/10/10/10/10/10/10/10/10/10/10/10/10/10/10/10/1
Input byte 0