Omron E5ZN-DRT Operation Manual page 138

Indicators and Error Processing
Indicator status Probable cause
MS: ON green A communications tim-
eout has occurred.
NS: Flashing red
The Unit is faulty.
TS: OFF Communications with
the Temperature Con-
trollers have stopped.
The Unit is faulty.
TS: Flashing red One or more of the con-
nected Temperature
Controllers is faulty.
One or more of the con-
nected Temperature
Controllers has been
disconnected.
The unit number of one
or more Temperature
Controllers registered in
the connection configu-
ration is incorrect.
Pin 1 of the rear panel
DIP switch is set incor-
rectly.
Power is not being sup-
plied to the Terminal
Unit.
The Unit is faulty.
TS: Flashing red A communications error
occurred with the Tem-
(Flashes for 10 s
perature Controller
only.)
when copy was exe-
cuted.
The settings down-
loaded for a Tempera-
ture Controller
configuration that is dif-
ferent from that used
when uploading.
Section 8-1
Remedy
Check the following items and restart
the Unit.
• Are lengths of cables (trunk and
branch lines) correct?
• Are cables short-circuited, broken,
or loose?
• Is terminating resistance connected
to both ends of the trunk line only?
• Is noise interference excessive?
Replace the Unit.
Set the Temperature Controller con-
nection configuration.
Replace the Unit.
Replace the faulty Temperature Con-
trollers. Check the communications
status and communications error sta-
tus to detect which Temperature Con-
troller is faulty.
Connect the Temperature Controllers
correctly. Check the communications
status and communications error sta-
tus to detect which Temperature Con-
troller is disconnected.
Change the unit number of the Tem-
perature Controller or register the
connection configuration correctly.
Set correctly as follows:
Pin 1: ON (Set from rotary switch.)
Pin 1: OFF (Set from Configurator.)
Supply 24-VDC power to terminals 19
and 20 of the leftmost Terminal Unit.
Replace the Unit.
• Check whether the Terminal Unit
connections are loose.
• When the configuration consists of
multiple blocks, check the RS-485
communications cables.
Use the same Temperature Controller
configuration for downloading that
was used when uploading.
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