13
Unit Numbers and I/O Allocations Section 2-2
The TS indicator shows the status of the Slice I/O Unit itself and the I/O indi-
cators show the status of the connected devices.
■ Digital I/O Units
The following table shows the meaning of the yellow I/O indicator.
The following table shows the meaning of the red ERR indicator.
2-2 Unit Numbers and I/O Allocations
2-2-1 Unit Numbers of Slice I/O Units (Automatically Allocated)
The numbers used to identify the Slice I/O Units in a Slice I/O Terminal are
called the Slice I/O Units’ unit numbers. These unit numbers are allocated
automatically from left to right starting from #1, when the power is turned ON.
It is not necessary for the user to set these numbers.
Name Color Status Meaning
TS Green Lit Normal status Normal Unit status
Normal network status
Flashing Operating The automatic restore/backup
function is operating.
Red Lit Fatal error Unit hardware error
(EEPROM error or WDT
error)
Flashing Non-fatal error Communications timeout,
incorrect switch setting, etc.
Cold junction compensator
error (GRT1-TS2T only)
--- Not lit No power • Unit power supply is OFF.
• Unit is waiting for initializa-
tion.
• Unit is being reset.
TS
TS
TS
TS
Name Color Status Meaning
I/O Yellow Lit Normal status I/O ON
--- Not lit --- I/O OFF
Name Color Status Meaning
ERR Red Lit Error The error depends on the
Unit. Refer to specific infor-
mation for the relative Unit.
--- Not lit Normal status No error has occurred.
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