I have an alarm on my OSP-U10 display, as follows.

[812 alarm-p servo link start ef000005]
[lack controller 1ch. disconnect]

Any and all info. would be helpful

scorch,
this is from our E100, but it should get you real close:

0812 MCS start
An error occurred in initialization of MCS when the power was supplied.
[Index]
None or axis name
[Character-string]
Varies with the code.
[Code]
XXXXYYYY
XXXX: Kind of generated alarm
YYYY: Further information on the alarm (Varies with XXXX.)
XXXX
FFFF...YYYY is 00UV. Where,
U: Faulty channel number - 1
0= Channel 1
1= Channel 2
2= Channel 3
V: Cause of alarm
V=1 indicates that servo link mode has not been established.
V=2 indicates that more than one safety speed monitor is connected to onechannel.
FF01...Memory error occurred in read/write test of the servo link I/O buffer.
YYYY= 0 (always)
Character-string shows the address where the error occurred.
FF00...Communication LSI caused an error in read/write test of the servo link I/O buffer.
YYYY= Error status
Character-string shows the address where the error occurred.
F000...
YYYY=bit 7:Same ID number used
bit 6:Improper ID number
bit 5:Missing ID number
bit 4:Too many CH4 controllers
bit 3:Too many CH3 controllers
bit 2:Too many CH2 controllers
bit 1:Too many CH1 controllers
bit 0:
With this error, connection data appears in the screen center.
EF00...The servo link does not connect with all the required axes or connects with an improper axis.
YYYY= ID number of required axis controller

Thanks for the detailed info.
We have narrowed it down to our X-axis MIV (ef000005).
Now whether its the MIV or servo link/converter cabling we have yet to discover.

no sweat and good luck