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Table 1-1: Significance of General LEDs
LED Signals
HC8X in Mode
Function
LED 25 (green)
Short blink once per second
Idle
EEPROM data invalid
HC8X inactive
Green channel LEDs (1
–
8) blink at the same rate
LED25 (green)
Short blink twice per second
Prog
The serial interface is set to 9600 baud
Control unit parameters can be modified in the processor dialog
LED 25 (green)
Blinks three times per second
Norm
At least one control channel is in the alarm state
The respective channel LED blinks at the same rate
LED 25 (green)
Steady light
Norm
All EEPROM data are valid
All channels are free from error
LED 1 – LED 8 (green)
Short blink once per second
Idle
LED 25 blinks at the same rate
HC8X inactive
LED 1 – LED 8 (green)
Short blink once per second
Norm
Associated channel was previously disabled in programming
mode
Control function not available
LED 1 – LED 8 (green)
Short blink twice per second
Prog
LED 25 blinks at the same rate
HC8X in programming mode
LED 1 – LED 8 (green)
Short blink three times per second
Norm
LED 25 blinks at the same rate
Alarm on respective channel
Error acknowledgment with slide switch or with a software reset
command via the serial interface
LED 1 – LED 8 (green)
Steady light
Norm
Correct state of the control of the respective channel
LED 1 – LED 8 (green)
Long blink once per second
Norm
The respective control channel was set to follower mode in the
programming mode
The heating circuits follow the control function of the previous
channel
LED 9 – LED 16 (red)
Steady light
Norm
Working relay of channels 1
–
8 is excited
LED 17 – LED 24 (red)
Steady light
Norm
Safety relay of channels 1
–
8 is excited
Chapter
1
Technical Information
HC8X Heat Control
1-18
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