4 Feed Axis Operation
4.7.2 Homing Method When Using an Absolute Encoder as an Incremental Encoder
4-34
Step 5:
After the overtravel signal (P-OT or N-OT) changes (after passing the overtravel signal), a phase-C latch is
requested. The latch position (LPOS1) is specified for one of the SMON1 to SMON3 monitors to read the
phase-C latch position at the same time.
The INTERPOLATE (34 hex) command is sent as follows:
• SVCMD_CTRL.LT_SEL1 (bits 10 and 11) = (0,0) (Selects phase C.)
• SVCMD_CTRL.LT_REQ1 (bit 8) = 1 (Requests a phase-C latch.)
• SVCMD_CTRL.SMON1 = 3 (Selects LPOS1 (set for SMON1, SMON2, or SMON3).)
Step 6:
Monitoring is performed for in SVCMD_STAT.L_CMP1 (bit 8) to change to 1 to detect the completion of the
phase-C latch operation while feeding the axis at the creep speed.
Step 7:
When the latch operation is completed, the latch request is turned OFF and the latch position (LPOS1) is read
from the specified monitor.
The homing distance is added to the read position to find the origin, then positioning is performed at the posi-
tioning speed for the remaining distance.
The INTERPOLATE (34 hex) command is sent as follows:
• SVCMD_CTRL.LT_SEL1 (bits 10 and 11) = (0,0) (Selects phase C.)
• SVCMD_CTRL.LT_REQ1 = 0 (Turns OFF latch request.)
Step 8:
Execution of homing is completed when positioning is completed. Set the host controller’s machine coordi-
nate system with the origin as the reference position (CPOS) at this time.