An error occurred when RAM test is being executed.
Alternatively, there is a poor connection in the FANUC I/O Link master
function, or the power for a slave unit has been switched off.
The following causes are considered :
⋅ CPU card is faulty
⋅ DRAM module is faulty
⋅ Memory module is faulty.
⋅ Base PC board is faulty.
Replace the above PC boards.
When the base PC board or memory module is replaced, all
the data stored in memory is lost. Set data again, referring
to Chapter 3 “INPUT AND OUTPUT OF DATA”.
(2)FANUC I/O Link master function
The probable causes are:
⋅ Poor contact in connector JD1A
⋅ The power for an I/O Link slave unit is off.
⋅ An I/O Link cable wire has broken.
With the basic function version 03 and later versions, if the
alarm is due to the I/O Link master function, alarm 977 is
Causes and Remedies