Omron EJ1 User Manual

137
Programless Communications Section 5-1
5-1-6 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
• Unit number
• Whether or not the value being changed can be changed.
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.
■ 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)

Omron EJ1 Specifications

General

Brand	Omron
Model	EJ1
Category	Temperature Controller
Language	English