120
Programless Communications
Section 5-6
5-6-6
Programless Communications Errors
Possible Causes of
Parameter Access
Problems
• A value outside the setting range was written.
• A non-existent Unit was accessed.
• An attempt was made to change a setting for which changes are prohib-
ited. Example: An attempt was made to change the SP during autotuning.
In the above cases, the Response Bits will be set to the following error values.
If an error value is set for Response Bits, check the following items.
• Setting range
• Whether or not the value being changed can be changed.
Use the following procedure to clear the error value.
1.
Set the Request Bit corresponding to the Response Bit for which the error
value was set to 0000 (Stop operation).
2.
Check whether or not the setting range and the value being changed can
be changed at the moment then correct the error.
3.
Set the Request Bit again.
Errors in
Communications with
PLCs
If noise or other cause results in a communications error with the PLC, the
EJ1G will stop programless communications and set the Operation Command
Response Bits to EEEE.
■
Method for Canceling Communications Errors
1,2,3...
1.
Set the Operation Command Request Bits to FFFF.
2.
The Operation Command Response Bits will be set to FFFF and the pro-
gramless communications will return to the initial status.
Note
If the Read Request Bits or Setting Change Request Bits are set,
restart operation according to the request.
3.
Set the Operation Command Request Bits to 0000, then check that the Op-
eration Command Response Bits have been set to 0000.
Note
Operation commands cannot be executed while the Operation
Command Response Bits are set to FFFF.
If the communications line is disconnected or the PLC power supply turns
OFF during programless communications, a programless communications
error will occur after the following times have expired.
Note
If a programless communications error occurs because the PLC power supply
turns OFF when using the 1:N NT Link protocol, the error can be cleared by
turn ON the PLC power supply.
Bits
Operation
Error value
Read Response Bits
Single Read
8001
Multi Read
8002
Setting Change Response Bits
Single Action
8001
Multi action
8002
Operation Command Response Bits
Single Operation Commands
8001
Multi Operation Commands
8002
Programless
communications
protocol
Maximum time until programless communications
error
1:N NT Link
30 s (See note.)
MC Protocol (Format 5)
Programless Communications Receive Wait Times
×
3 (6 s
for the default setting)
Summary of Contents for EJ1G
Page 3: ...iv ...
Page 17: ...xviii ...
Page 21: ...xxii ...
Page 53: ...32 Unit Configuration Examples Section 2 4 ...
Page 69: ...48 Changing SPs During Operation Section 3 3 ...
Page 81: ...60 Other Functions Section 4 5 ...
Page 145: ...124 Other HFU Functions Section 5 7 ...
Page 167: ...146 Detailed Description of Services Section 6 4 ...
Page 229: ...208 Parameters That Can Be Allocated for Programless Communications Appendix ...
Page 237: ......