[serickson]

The machine is an '80s Mazak H-20 Horizontal Machining Center with a Fanuc 6M(A) control, Series 993 Ver 10.
The machine has been operating without the Stored Stroke Limit feature enabled (parm 002, bit 3 = 0) normally.
We would like to set software limits inside the mechanical limit switches. We set parm 002 bit 3 = 1 (enable stored stroke limits), then set parm 143 (only testing on X axis for now) to 99999999 & parm 147 to -99999999, just for testing. As soon as the Zero Ref return is completed the Alarm 212 comes up :+X S Lim.
We tried changing parm 143 to 00000000 & parm 147 to 00000000 - same result. Tried setting parm 143 to -99999999 & parm 147 to 99999999 - same software limit alarm.
On this machine Zero Ref is at the maximum positive X position.
Set the parm 143 & 147 to values that we calculated, left the machine in the X position where it was, turned off power to the machine & powered back up.
Without doing a Zero Ref, we could jog the machine to out calculated soft limit position & machine stopped as expected, with the Alarm 212.
So why does the control Alarm out the instant the Zero ref is completed?

Cheers,
Steve

[servtech]

The machine is an '80s Mazak H-20 Horizontal Machining Center with a Fanuc 6M(A) control, Series 993 Ver 10.
The machine has been operating without the Stored Stroke Limit feature enabled (parm 002, bit 3 = 0) normally.
We would like to set software limits inside the mechanical limit switches. We set parm 002 bit 3 = 1 (enable stored stroke limits), then set parm 143 (only testing on X axis for now) to 99999999 & parm 147 to -99999999, just for testing. As soon as the Zero Ref return is completed the Alarm 212 comes up :+X S Lim.
We tried changing parm 143 to 00000000 & parm 147 to 00000000 - same result. Tried setting parm 143 to -99999999 & parm 147 to 99999999 - same software limit alarm.
On this machine Zero Ref is at the maximum positive X position.
Set the parm 143 & 147 to values that we calculated, left the machine in the X position where it was, turned off power to the machine & powered back up.
Without doing a Zero Ref, we could jog the machine to out calculated soft limit position & machine stopped as expected, with the Alarm 212.
So why does the control Alarm out the instant the Zero ref is completed?

Cheers,
Steve

It's possible you have second soft limit parameters set, page through to find them. Sometimes have them for toolchanging or pallet changer if you have one.