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Issue 5 - September 2006
Page 23 of 65
3.5.7 Monitor flag register
The setting of bit 3 in the ‘FALT’ call register above results from any bit being set in the 16 bit
monitor flag register. These bits are set in the shared RAM on the common Interface by the
microcontroller and read by the main processors.
Bit Reference Description
0
Microcontroller
health A
Microcontroller A watchdog timer timed out
1
Microcontroller
health B
Microcontroller B watchdog timer timed out
2
Microcontroller
health C
Microcontroller C watchdog timer timed out
3
MPP A health
MPP A watchdog timer timed out
4
MPP B health
MPP B watchdog timer timed out
5
MPP C health
MPP C watchdog timer timed out
6
Power fault
Any power fault on the module
7
Reserved
8
Reserved
9
Reserved
10 Reserved
11 Reserved
12 Programmatic
Health – A
Health Lamp turned off by microcontroller A
13 Programmatic
Health – B
Health Lamp turned off by microcontroller B
14 Programmatic
Health – C
Health Lamp turned off by microcontroller C
15 Reserved
Table 2 Monitor Flag Register
3.5.8 I/O module dependant fault flags
The 16 bit fault flag register has a format dependant on the I/O module type.
Currently only the DO and Piano and Analogue output modules are supported.
Bit Description
0
Logic Supply A power fail fault
1
Logic Supply B power fail fault
2
Logic Supply C power fail fault
3
Field Supply A power fail fault
4
Field Supply B power fail fault
5
Field Supply C power fail fault
6
Bias Supply 1 power fail fault
7
Bias Supply 2 power fail fault
8
Logic supply power fail fault
9
Reserved
10 Reserved
11
Drive Supply A power fail fault
12
Drive Supply B power fail fault
13
Drive Supply C power fail fault
14
Field supply power fail fault
15
Over temperature fault (not currently implemented in hardware)
Table 3 Digital Output Fault Flags
Bit Description
0
Logic Supply A power fail fault