Toshiba V Series User Manual page 28

Chapter 1 Overview of Loop Controller L3
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Figure 1-10 shows the front panel of L3 CPU module (L3PU21).
Status LED
(RUN/HARD/SOFT/EXT)
Figure 1-10 Front Panel of L3 CPU Module (L3PU21)
(1) Status LED
Indicates the operation status (RUN/HALT/ERROR mode) of the L3 controller.
Table 1-7 Indication by Status LED
Name of LED
RUN Lit: RUN mode
Unlit: HALT/ERROR mode
HARD For error attributed to hardware
Unlit: Error of major failure
Blinking: Error of major failure that can be eliminated
Lit: Normal
SOFT For error attributed to software
Unlit: Error of major failure
Blinking: Error of minor failure that can be eliminated
Lit: Normal
EXT Indication of access by the engineering tool
Lit: Accessing
7-segment LED
7-segment display
mode switch
Mode switch (Key switch)
(HALT/RUN/P-RUN)
Engineering tool connector
(TOOL: RS-232C)
Maintenance connector
(MAINT: RS-232C)
Serial bus connector
(SB: RS-485)
Indication
model 3000 Loop Controller L3 User's Manual - Basic Hardware -