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CHAPTER6 FUNCTIONS
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6.21 LED Display
6.21.1 Methods for turning off the LEDs
6.21.1Methods for turning off the LEDs
(1) Methods
(a) Basic model QCPU
To turn off the ERR.LED, remove the error cause and then operate the special relay SM50 and special register
SD50 to clear the error (except for reset operation).
(b) High Performance model QCPU, Process CPU, and Redundant CPU
The LEDs can be turned off by the following operations (except for reset operation.)
: Valid, : Invalid
*1: Description of special relays and special registers
Configure setting to turn off each LED as follows:
• Turning off both the Boot LED and USER LED : SD202 = 110
H
• Turning off only the BOOT LED : SD202 = 100
H
• Turning off only the USER LED : SD202 = 10
H
(2) Methods for not turning on the ERR. LED, USER LED, and BAT. LED
There is a priority in indications of the ERR.LED, USER LED, and BAT.LED. ( Section 6.21.2)
When an cause number of an LED is deleted in the priority, the LED will not turn on even if an error with the cause
number occurs.
Table6.33 Methods for turing off the LEDs
Method for turning off the LED
Applicable LED
ERR. USER BAT. BOOT
Execute the LEDR instruction after resolving the error.
After resolving the error, clear the error by the special relay SM50 and special
register SD50
*1
(operation continuation error only).
Turn off the LED by the special relay SM202 and special register SD202.
*1
• SM50 : Clears an error of the error code stored in SD50 when the CPU module is powered off and then on.
•SD50 :
Stores an code of an error to be cleared.
For details of error codes, refer to the following.
QCPU User's Manual (Hardware Design/Maintenance and Inspection)
• SM202 : Turns off the LED corresponding to each bit of SD202 when the CPU module is powered off and then on.
• SD202 : Set an LED to be turned off.
Figure 6.84 Bit structure of the special register SD202
b15 b8 b4 b0
SD20
1/0 1/0
BOOT LED USER LED
0: Not turn on.
1: Turns on.
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