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National Instruments Corporation
9
MID-7604/7602 Stepper Power Motor Drive User Guide
The polarity of the per-axis inhibit input is selectable from the front panel DIP switches. Refer to the
Front Panel DIP Switch Settings
section of this guide for more information.
Limit Status LEDs
The bottom row of LEDs indicates whether or not a limit switch is currently active. The LED illuminates
green if either the forward or reverse limit switch is active for each axis. You can select the polarity for
the limit status LEDs from the front panel DIP switches. Refer to the
Front Panel DIP Switch Settings
section of this guide for more information.
Front Panel DIP Switch Settings
The MID-7604/7602 front panel has a detachable metal plate that when removed provides access to
four 10-position DIP switch banks. Refer to Figure 1 for the location of these switches.
Use the first nine DIP switches on each 10-position DIP switch bank to configure the microstep rate,
peak output current, and current reduction for each axis. The DIP switch banks for axes 1 and 2 contain
a global DIP switch, switch 10, which sets the polarity of the inhibit input and the polarity of the limit
status LED, respectively. Figure 3 shows the DIP switch bank layout.
Figure 3.
DIP Switch Bank Layout
1
Peak Current Output Switches
2
Microstep Rate Switches
3
Current Reduction Switch
4
Global Polarity Switch (unused on axes 3 and 4 DIP
switch banks)
1
2
3
4
5
6
7
8
9
10
O
N
4
3
1
2
