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14
Control System Configuration
Section 1-4
Print Registration
The MC Unit can capture the position of an axis in a register when an event
occurs. The event is referred to as the print registration input. On the rising or
falling edge of an input signal, which is either the Z-marker or an input, the MC
Unit captures the position of an axis in hardware. This position can then be
used to correct possible error between the actual position and the desired
position. The print registration is set up by using the REGIST command.
The position is captured in hardware, and therefore there is no software over-
head and no interrupt service routines, eliminating the need to deal with the
associated timing issues.
Merging Moves
If the MERGE axis parameter is set to 1, a movement will always be followed
by a subsequent movement without stopping. The following illustrations will
show the transitions of two moves with MERGE value 0 and value 1.
Jogging
Jogging moves the axes at a constant speed forward or reverse by manual
operation of the digital inputs. Different speeds are also selectable by input.
Refer to the FWD_JOG, REV_JOG and FAST_JOG axis parameters.
1-4
Control System Configuration
1-4-1
Servo System Principles
The servo system used by and the internal operation of the MC Unit are
briefly described in this section. Refer to 2-4 Servo System Precautions for
precautions related to servo system operation.
Semi-closed Loop System
The servo system of the MC Unit uses a semi-closed or inferred closed loop
system. This system detects actual machine movements by the rotation of the
motor in relation to a target value. It calculates the error between the target
value and actual movement, and reduces the error through feedback.
Speed
Time
Speed
Time
MERGE=0
MERGE=1