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Auxiliary Area
3-6-25 Error Code
3-6-26 FALS Flag
3-6-27 Cycle Time Too Long Flag
3-6-28 Program Error Flag
3-6-29 I/O Setting Error Flag
3-6-30 Too Many I/O Points Flag
3-6-31 CPU Bus Error and Unit Flags
3-6-32 Duplication Error Flag and Duplicate Rack/CPU Bus Unit Numbers
3-6-33 I/O Bus Error Flag and I/O Bus Error Slot/Rack Numbers
When an error or alarm occurs, the error code is written to A400. If two errors
occur simultaneously, the more serious error, with a higher error code, is re-
corded. Refer to Section 6 Troubleshooting in the CVM1D PCs Installation
Guide for details on error codes.
Bit A40106 is turned ON when the SEVERE ALARM FAILURE instruction
(FALS(007)) is executed. The FAL number is written to word A400.
Bit A40108 is turned ON if the cycle time exceeds the cycle time monitoring time
(i.e., the maximum cycle time) set in the PC Setup.
Bit A40109 is turned ON if there is a program syntax error (including no
END(001) instruction).
Bit A40110 is turned ON if the I/O designation of a slot has changed, e.g., an
Input Unit has been installed in an Output Unit's slot, or vice versa.
Bit A40111 is turned ON if the total number of I/O points being used exceeds the
maximum for the PC. The total number of I/O points being used on CPU and Ex-
pansion Racks is written to word A407; in the SYSMAC BUS/2 system, to word
A408; and in the SYSMAC BUS system, to word A478.
Bit A40112 is turned ON when an error occurs during the transmission of data
between the CPU and CPU Bus Units, or a WDT (watchdog timer) error occurs
in a CPU Bus Unit. The unit number of the CPU Bus Unit involved is contained in
word A405.
Bits A40500 through A40515 correspond to CPU Bus Units #0 through #15, re-
spectively. When a CPU Bus Error occurs, the bit corresponding to the unit num-
ber of the CPU Bus Unit involved is turned ON.
Bit A40113 is turned ON when two Racks are assigned the same rack number,
two CPU Bus Units are assigned the same unit number, or the same words are
allocated to more than one Rack or Unit in the PC Setup. The duplicate Expan-
sion I/O Rack number is written to word A409, and the duplicate CPU Bus Unit
number is written to word A410.
Bits A40900 through A40907 correspond to Racks #0 through #7, respectively.
When two Racks have the same rack number, the bits corresponding to the rack
numbers involved are turned ON. Bit A40915 is also turned ON to indicate that
the same words are allocated to more than one Rack or Unit in the PC Setup.
Bits A41000 through A41015 correspond to CPU Bus Units #0 through #15, re-
spectively. When two CPU Bus Units have the same unit number, the bits corre-
sponding to the unit numbers of the CPU Bus Units involved are turned ON.
Bit A40114 is turned ON when an error occurs during the transmission of data
between the CPU and I/O Units through the I/O bus, or a terminator is not
Section 3-6
53
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