Yokogawa Data Acquisition with PID Control CX2000 - Manual (Page 255)

9-22
IM 04L31A01-17E
9.7 Checking the Operating Conditions of the
Green Series Communication Function
Explanation
“EXTLOOP STATUS” Display
You can check the operating conditions of the Green Series communication function
on the “EXTLOOP STATUS” display.
CX2000 screen example
On the CX1000, up to loop 4 is displayed.
Controller address
Detail code Status lamp
Communication condition
Communication Status
The communication status is displayed using the status lamp and the detail code.
Status Lamp Detail Code Meaning
Green GOOD Communication is operating normally.
Yellow Retrying.
Red Communications stopped since communications did not
recover after the specified number of retrials.
NONE No response from the controller.
FUNC The controller cannot execute the command from the CX.
REGI The controller does not have the specified register.
ERR There is an error in the response data from the controller.
(Space) The detail code is not displayed until the status is confirmed
when communication is started or during retrial.
Resuming Command Transmission
You can use the front panel keys to resume command transmission to the controller
(red status lamp) to which command transmission is stopped.
Data during Retrial and When Communication Is Stopped
The communication input data is held at the previous value during retrial. When
command transmission is stopped, communication input data becomes error data. In
this case, the data display shows “+******.”
Data Dropout
If the communications with the controllers from 1 to 16 (1 to 4 on the CX1000) are not
completed within the read cycle, data dropout occurs. When a data dropout occurs,
the communication input data is held at the previous value. Set a longer read cycle or
reduce the number commands so that communications with the controllers can be
completed within the read cycle.