User Manual PLC-3 FAMILY I/0 Instruction Manual

DH/DH+ Error Codes
Appendix B
B-4
Error Code MeaningAssociated
Commands
Error Type
84 reply diagnostic status Backplane error occurred during determination of the physical address of the end
of the ladder program or of the end of user memory. In polled mode, the
RS232C port has received a NAK, which causes a system reset.
reply PLC/PLC2 read,
write
Local PLC3 backplane error (either memory parity or timeout/disconnect). In
polled mode, the RS232C port has received a NAK, which causes a system
shutdown.
reply PLC3 read and
write
Backplane error (memory parity or timeout/disconnect). In polled mode, the
RS232C port has received a NAK, which causes a system reset.
85 reply diagnostic read The command is an illegal request to read from the scanner's backplane window.
reply PLC/PLC2 read
• PLC3 file does not exist.
• PLC3 file is too small.
• PLC3 file is more than 65,535 words long.
reply PLC/PLC2 bit write
• PLC3 file does not exist.
• Destination bits do not exist in PLC3 file.
• Length of PLC3 file is greater than 65,535 words.
reply PLC/PLC2 word
write
• Destination file does not exist in PLC3 memory.
• Destination word does not exist in the destination PLC3 file.
• Length of the destination file is greater than 65,535 words.
86 reply PLC/PLC2 bit write Keyswitch setting at local PLC3 controller prohibits access.
reply PLC/PLC2 word
write
Local keyswitch settings prohibit writing into desired destination file.
reply PLC3 write Keyswitch setting disallows access to file.
87 reply PLC/PLC2/PLC3
read and write
The local PLC3 controller is in program mode. There may or may not be a major
system fault.
91 local all
• Handshaking lines on the RS232C link are not connected properly.
• Multiple wacks on link.
92 local all The remote station specified does not acknowledge (ACK) the message.
94 local all Remote station is disabled.
112 local all Undefined operator in an assignment statement or expression.
114 local all Illegal expression syntax.
115 local all Illegal unary (prefix) operator in an expression.
117 local all Undefined data following a valid address in a CREATE command, or undefined
data following a valid symbol in a delete command.
121 local all Symbol undefined because it appears as the source in an assignment command
before it is defined. For example, a statement of the form A = A + 6 generates
this error if user symbol A has not appeared previously.
123 local all System symbol must be a symbolic address. This error occurs if a procedure
name is used in place of a symbolic address in an assignment statement or if the
system symbol referenced in an assignment does not exist.