Download 1775-6.4.1, PLC-3 Family Programmable Controller, Programming

Chapter 14
Addressing Memory and Monitoring
Controller Status
Figure 14.9
Minor Fault Status Bits (Status File 0, Word 2)
17
16
15
14
13
12
11
10
07
Interrupt overlap
Battery high
06
05
04
03
02
01
00
Peer–to–peer or backup communication error
Single–bit error
Battery low
Thermal fault
Minor I/O fault
Bit
Title
The processor sets this bit when
10
peer-to-peer or
backup
communication
error
the primary or backup processor detects a backup
communicaiton error, the master processor detects a
peer-to-peer communication error, or the data transmitted
exceeds the size of the specified input file
11
single-bit error
an error correcting (EDC) memory module detects single-bit
errors
12
thermal fault
a thermistor on the processor detects incoming ambient air
temperature higher than 60°C or 140°F
13
minor I/O fault
communication disrupts between a scanner and an I/O adapter
14
battery low
a memory module contains a battery that lacks sufficient charge
15
battery high
a memory module containing a lithium battery has an
overvoltage condition. If you are using a nicad battery, do not
monitor this bit.
16
interrupt overlap
the real-time interrupt routine exceeds the set point specified
through LIST
14-17