286
LED Indicators and Error Processing Section 9-2
Lit Not lit Flashing
Slice I/O Unit
(GRT1-TS2@)
ERR1 Red Input error occurred in input 1. Check the following items.
• Check if the sensor is disconnected, never
was connected, short-circuited, or wired
incorrectly.
• Check the terminal block to see if it is dis-
connected.
• If using a 2-wire connection, check to be
sure the SHT terminals are shorted.
• Check the sensor to see if it is of the cor-
rect input type.
• Check to see if the temperature is outside
the convertible temperature range.
Cold junction compensator
error occurred.
Check the cold junction compensation
(GRT1-TS2T only.)
--- There is no input error for
input 1. (Not lit when input
error detection is disabled
using the input error detec-
tion disable setting.)
GRT1-OD4G-
3
PWR Green I/O power and Unit power are
being supplied.
---
--- I/O power or Unit power is not
being supplied.
Check whether power is being supplied by
the I/O power supply and Unit Power Sup-
ply.
GRT1-PD2,
GRT1-PD8,
and GRT1-
PD8-1
I/O Power
Feed Units
or
GRT1-PC8,
and GRT1-
PC8-1
I/O Power
Connection
Units
IO
PWR
Green I/O power is being supplied
normally.
---
--- I/O power is not being sup-
plied to the Unit.
Check whether power is being supplied
from the I/O power supply.
An overcurrent has occurred. Check the ERR indicator on the GRT1-
PD2G only.
GRT1-PD2G I/
O Power Feed
Unit
ERR Red An overcurrent has occurred. Remove the overcurrent, and then turn the
power supply OFF and ON or input a reset
signal.
--- An overcurrent has not
occurred.
---
GRT1-TBL
Left Turnback
Unit
UNIT
PWR
Green Unit power supply is providing
power normally.
---
--- Unit power supply is not being
supplied to the Unit.
Check whether power is being supplied by
the Unit power supply.
IO
PWR
Green I/O power supply is providing
power normally.
---
--- I/O power supply is not being
supplied to the Unit.
Check whether power is being supplied by
the I/O power supply.
Unit LED
name
Color Status Meaning Likely cause of error
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