Siemens TC12 Installation, Commissioning And Maintenance Handbook page 192

Functions available:
0
1
..
23
24 - 97
98
99
100
101
102
110
111
112
..
170
171
172
255
Note: Functions 103 - 109, 113 - 119 etc and 173 to 254 are not used.
6.4.2.2 Fault Flags/Data associated with Integral OTU
Fault Flag 58 - Fault with the Integral OTU and/or the facility (FLD 81)
Fault Data 81
This single fault data byte indicates the problem with the integral OTU
facility or the integral OTU itself.
Bit 0: Automatically set when the integral OTU has any fault in its fault
Bit 1: The Integral OTU has appeared to have failed or is not connected.
The following faults cannot be cleared by RFL=1 alone, most require the
OTU facility to be reset by either:
666/HE/43100/000
TC12 Installation, Commissioning & Maintenance Handbook
Control Bit 0 (Bit 0 of Word 0)
Control Bit 1 (Bit 1 of Word 0)
..........................
Control Bit 23 (Bit 7 of Word 2)
Not used
Any lamp failure in any group
Any Red Lamp failure in any group
Any lamp failure in group 0
1st Red Lamp failure in group 0
2nd Red Lamp failure in group 0
Any lamp failure in group 1
1st Red Lamp failure in group 1
2nd Red Lamp failure in group 1
.. .. .. .. .. .. .. ..
Any lamp failure in group 7
1st Red Lamp failure in group 7
2nd Red Lamp failure in group 7
No function.
log, use the OTU commands 'GLF' and 'KLF' to examine the OTU
fault log.
RFL=1 will clear this fault if the OTU is now running, i.e. it failed for
just a short time.
Changing the value of the OTU fitted flag - OTF command,
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