FCU 500, FCU 505 · Edition 02.17 67
Fieldbus communication via Ethernet
STM/STL temperature (FCU ➔ PLC)
This module/register transfers the STM temperature
values (for high temperature operation) and STL tem-
perature values (for maximum temperature monitoring)
from the protective system control FCU..H1 to the PLC.
Bytes 1 and 2 are used to transfer the lower of the two
temperature values measured by the double thermo-
couple to the PLC. The measured temperature must
be higher than the set limit value, see page 84 (STM
limit value (high temperature operation)).
Bit Byte n Byte n+1 Data type Format Value
0
STM temperature Word DEC
0 – 65535
(0 to 65,535K)
1
2
3
4
5
6
7
Bytes 3 and 4 are used to transfer the higher of the two
temperature values measured by the double thermo-
couple to the PLC. The measured temperature must be
higher than the set limit value, see page 84 (STL/
FSTL limit value (system protection)).
Bit Byte n+2 Byte n+3 Data type Format Value
0
STL temperature Word DEC
0 – 65535
(0 to 65,535K)
1
2
3
4
5
6
7
Conversion of temperature values,
see www.adlatus.org
Byte 5 is used to send confirmation of whether the val-
ues are in the valid range after checking the plausibility
of the STL/STM temperature values.
Bit Byte n+4 Format
0 STM, temperature valid BOOL
1 STL, temperature valid BOOL
2 Free BOOL
3 Free BOOL
4 Free BOOL
5 Free BOOL
6 Free BOOL
7 Free BOOL
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