Machine Data and Incremental Dimensions
8-13
FM 351 Positioning Module
C79000-G7076-C351-02
Address Name Data
Type
Initial Value Description
44.0 REFPT DINT L#0 Reference point coordinate:
Range:
• –1 000 000 000 m to 1 000 000 000 m at
a resolution of 1 m/pulse
• –100 000 000 m to 100 000 000m
at a resolution of < 1 m/pulse
Incremental encoder:
You require the reference point coordinate for the “reference point approach” mode.
If the axis is not synchronized after writing and activating machine data, the actual value is set to the
value of the reference point coordinate.
Absolute encoder (SSI)
You require the reference point coordinate for the mechanical adjustment of the encoder.
Read the description of absolute encoder adjustment in Section 8.6 (page 8-19), explaining the
interaction of absolute encoder adjustment with other data.
The value of the reference point coordinate must be within the working range:
• Linear axis
including the software limit switches
• Rotary axis
Greater than or equal to 0 and less than the value “end of the rotary axis” (0 reference point
coordinate < “end of the rotary axis”).
Address Name Data
Type
Initial Value Description
52.0 REFPT_TYPE DINT L#0 Type of reference point approach:
Ranges:
0 = plus, ref. point switch in direction +
1 = plus, ref. point switch in direction –
2 = minus, ref. point switch in direction +
3 = minus, ref. point switch in direction –
With type of reference point approach, you select the conditions for synchronization of the axis.
• The first statement defines the start direction in which the reference point approach starts.
• The second statement defines the location of the zero marker that leads to synchronization relative to
the reference point switch.
Use of this data is described in Section 9.3 (page 9-11).
Address Name Data
Type
Initial Value Description
99.0 REFPT_SPD BOOL TRUE Start speed for reference point approach
0 = rapid speed
1 = creep speed
With this data you select the speed for the start of a reference point approach:
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