154
Programless Communications
Section 5-1
5-1-7
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
• Unit number
• Whether or not the value being changed can be changed.
Use the following procedure to clear error values.
1,2,3...
1.
Set the Response Bits to 0000 (stop operation) for the Request Bits for
which the error value was set.
2.
Check the communications unit number and setting range, be sure that the
present value can be changed, and correct the error.
3.
Set the Request Bits again.
Errors in
Communications with
PLCs
If noise or other cause results in a communications error with the PLC, the
EJ1 will stop programless communications and set the Operation Command
Response Bits to EEEE. (With version
, however, communications will
be stopped only when the Selection of Programless Communications Opera-
tion during Error parameter is set to 1 (stop).)
■
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.
Bits
Operation
Error value
Read Response
Bits
Single Read
8001
Multi Read
8002
Setting Change
Response Bits
Single Action
8001
Multi action
8002
Operation Com-
mand Response
Bits
Single Operation Commands
8001
Multi Operation Commands
8002
Single (bit specification) operation command
8003
Multi (bit specification) operation command
8004
V1.2
V1.2
V1.1
Summary of Contents for EJ1 EtherCAT
Page 2: ...EJ1 Modular Temperature Controllers User s Manual Revised July 2008 ...
Page 3: ...iv ...
Page 19: ...xx ...
Page 213: ...188 Detailed Description of Services Section 6 4 ...
Page 227: ...202 Detailed Description of Services Section 7 5 ...
Page 303: ...278 Index ...
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