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present position is within the zone; OFF (0) when it is not. You can set zones
to cover a wide range of positions or only part of a single positioning action.
Zones can also be set to overlap, if you wish. For an application example,
see programming example 8 in
Section 5.
The CW and CCW limits for any one zone are set in separate word pairs, i.e.,
four words total are required to establish one zone. These words are allo-
cated as follows:
Zone 0 CW limit:
DM m+9 and m+10, 7 digits with direction
Zone 0 CCW limit:
DM m+11 and m+12, 7 digits with direction
Zone 1 CW limit:
DM m+13 and m+14, 7 digits with direction
Zone 1 CCW limit:
DM m+15 and m+16, 7 digits with direction
Zone 2 CW limit:
DM m+17 and m+18, 7 digits with direction
Zone 2 CCW limit:
DM m+19 and m+20, 7 digits with direction
Note that the CW limit for any of the zones can be on the CCW side of the
origin; the CCW limit, on the CW side. In other words, a zone can either
cross the origin or be completely on one side of it. An alarm will be gener-
ated, however, if the CCW limit of a zone is set on the CW side of the CW
limit.
Zone 0 CW limit
CCW
Origin
CW
0
Zone 1 CCW limit
Zone 0 CCW limit
Inside zone
Inside zone
Zone 1 CW limit
Positioning axis
Example 1: Correct Setting
Zone 0 CCW limit
CCW
Origin
CW
0
Zone 0 CW limit
Positioning axis
Example 2: Incorrect Setting
When the present position is in one or more of the zones, zone flags in the IR
area are turned ON (1). The PC’s scan time, however, can produce a delay in
indication during pulse output. Flag allocations are as follows:
CW and CCW Limit Settings
Zone Flags
DM Area Allocation