2-7
Note 3. If a signal line or connector disconnection is detected, the cable may be, however, in a fully
conducting state. When there is no encoder signal or speed command signal, check the resis-
tance of the cable by pulling or bending the cable.
Command Timing Errors Result
• Command timing errors are detected when the C500-NC221-E or C500-NC222-E is in use.
• The error will be detected if a command that is not executable (e.g., the positioning command) is input
while the C500-NC221-E or C500-NC222-E is in positioning operation.
Probable cause Item to check Countermeasure
A command input is not
executable.
• The ladder program in use does
not check the status of the
C500-NC221-E or
C500-NC222-E.
Example: The C500-NC221-E or
C500-NC222-E starts up on
receipt of the Equal Flag of data
transfer completion.
• Change the program so that a
command will be given after
checking the status of the
C500-NC221-E or
C500-NC222-E.
Origin Proximity Non-detection Errors Result
• The C200H NC Unit will detect an origin proximity non-detection error if the origin proximity signal is not
input while the NC Unit is set for detecting the origin proximity signal.
• The origin proximity signal can be ignored if origin search mode 0 is selected for the NC Unit. The origin
proximity signal cannot be ignored, however, if origin search mode 1, 2, or 3 is selected for the NC Unit.
Probable cause Item to check Countermeasure
No origin proximity signal is input.
• No origin proximity signal is con-
nected to the origin proximity in-
put terminal.
• Input the origin proximity signal.
• The origin search mode setting
is incorrect.
• Select mode 0 and set the NC
Unit to No Origin Proximity.
Origin Non-detection Errors Result
• The C200H NC Unit has an origin non-detection error if the operation limit signal is detected while the ori-
gin signal is ON and the NC Unit is in origin search operation.
Probable cause Item to check Countermeasure
No origin signal is input.
• No origin signal is connected to
the origin signal input terminal.
• Input the origin signal.
• No origin signal is input due to
wiring mistakes or line discon-
nection.
• Connect the lines correctly.
Connection to Position Control Unit Chapter 2
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