Справочник Пользователя для Mitsubishi Electronics E60

I - 34 

 

Error No. 

Details 

Remedy 

MELSEC is held in error and reset states. 

•  Check the MELSEC states. 

The contents of MELSEC-specific code 
area in buffer memory have been 
destroyed. 

•  Check the MELSEC states. 

PLC serial link communication has stopped.
Note:  When WAIT is entered for the PLC 

serial link, only the preparation 
sequence has been established 
before the communication stops.  
Therefore, it is supposed that the 
basic specification parameters 
related to serial link parameters 
#1902 and #1903 are incorrect or 
the #1909 set-time "Tout (ini)" is too 
short. 

•  Check that HR571 card wiring and external 

sequencer transmission are normal. 

•  Check the diagnostic screen for link 

communication errors. 

•  Check whether the basic specification 

parameters related to serial link parameters 
are specified correctly. 

The preparation sequence is not sent from 
the master station.  Otherwise, the contents 
of the received preparation sequence are 
inconsistent with those of the parameters, 
so that the usual sequence cannot be 
started. 
Note:  When LINK is also entered for the 

PLC serial link, refer to "Note" in the 
section, "LINK". 

•  Check that the HR571 card rotary switch 

and wiring and the external sequencer 
transmission are normal. 

•  Check the diagnostic screen for link 

communication errors. 

The HR571 card operates abnormally or 
the rotary switch is set incorrectly. 

•  Check the HR571 card rotary switch and 

replace the HR571 card if required. 

The user PLC (ladder sequence) has an 
illegal code. 

•  Check the user PLC (ladder sequence) to 

see if it uses illegal device numbers or 
constants.