HEIDENHAIN iTNC 530 HSCI - Opening the Position Control Loop

844 HEIDENHAIN Technical Manual iTNC 530 HSCI
Opening the
position control
loop
If M4581 has been set, the control opens the loops of all axes and of the
spindle, and then performs an NC stop. This makes it possible, for example,
to open the position control loops and at the same time switch off the drives.
As with an external emergency stop, position monitoring is shut off for the
time defined in MP1150.1, and an actual-to-nominal value transfer is executed.
After the time defined in MP1150.1 has expired, position monitoring is again
active, for at least the time defined in MP1150.2.
If at a standstill or with an external stop, the PLC sets M4581 in the Program
Run Full Sequence, Program Run Single Block, or Positioning with MDI
operating modes, and then the axes are moved, the Approach position
function will be activated when the PLC resets M4581.
If MP4020 bit 8 = 1, then, if the axes are moved after an emergency stop,
"Approach position" is automatically activated.
If M4580 has been set, an external EMERGENCY STOP ("control is ready") is
not reported to the NC, but rather the function is executed like M4581.
If the position control loop is opened, the axis release in W1024/W1100 is
canceled.
MP1150.1 Time period for which the monitoring function is to remain
off after the fast PLC input defined in MP4130.0 is set
Input: 0 to 65.535 [s]
Recommended: 0.2 to 0.5
MP4020 PLC functions
Input: Bit 8 – Behavior after an ext. emergency stop
0: "Approach position" is not automatically activated
1: "Approach position" is automatically activated
Set Reset
M4580 Suppress emergency stop, open all
position control loops, NC stop
PLC PLC
M4581 Open all position control loops, NC
stop, activate "Approach position"
PLC PLC
W1024/1100 Axis enabling
Axis-specific: Dependence on MP4020
bit 14
0: Position control loop open
1: Position control loop closed
NC NC