PACSystems™ RX3i and RSTi-EP CPU Reference Manual Section 4
GFK-2222AK October 2019
CPU Operation 112
The analog diagnostic data contains both diagnostics and process data with the process
data being the High Alarm and Low Alarm bits. The diagnostic data is referenced with the
-[F]- and -[NF]- contacts. The process bits are referenced with the high alarm (-[HA]- and
low alarm (-[LA]-) contacts. The memory allocation for analog diagnostic data is one byte
per word of analog input and analog output allocated by programming software. When
an analog fault contact is referenced in the application program, the CPU does an
Inclusive OR on all bits in the diagnostic byte, except the process bits. The alarm contact is
closed if any diagnostic bit is ON and OFF only if all bits are OFF.
4.10.2.3 PACSystems Handling of GBC Faults
4.10.2.3.1 Defaulting of input data associated with failed/lost GBCs
When a GBC is missing, mismatched, or otherwise failed, the CPU applies the Input
Default setting for each device on that Genius bus when defaulting the input data. If the
device is configured for HOLD LAST STATE, the data is left alone. If the device is
configured for OFF, the input data is set to 0. If a redundant GBC is operational, the input
data is not affected.
4.10.2.3.2 Application of default input and diagnostic data for lost redundant blocks
When a GBC reports that a redundant block is lost, the CPU updates the input data tables
and input diagnostic tables with the default data during the very next input scan. The
output diagnostic data tables are updated during the very next output scan.
4.10.3 Power-Up and Power-Down Sequences
4.10.3.1 Power-Up Sequence
System power-up consists of the following parts:
▪ Power-up self-test
▪ CPU memory validation
▪ System configuration
▪ Intelligent option module self-test completion
▪ Intelligent option module dual port interface tests
▪ I/O system initialization
4.10.3.1.1 Power-Up Self-Test
On system power-up, many modules in the system perform a power-up diagnostic self-
test. The CPU module executes hardware checks and software validity checks. Intelligent
option modules perform setup and verification of on-board microprocessors, software
checksum verification, local hardware verification, and notification to the CPU of self-
check completion. Any failed tests are queued for reporting to the CPU during the system
configuration portion of the cycle.
If a low or failed battery (or Energy Pack fault) indication is present, a fault is logged in the
CPU fault table.
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