MID-7604/7602Power Drive 20 ni.com
Limit Switch TerminalBlocks
Forend-of-travel limit, home, inhibit input, and inhibit output connections,
MID-7604/7602axes have a separate, 6-position removable screw terminal
connector block. Figure 10 showsthe l imit switch terminal block pin
assignments.
Figure10. LimitSwitch Terminal Block Pin Assignment
(PassiveLimit Switch Connection Example)
Theinhibit output signal is asserted low from the MID-7604/7602 when an
axisis inhibited. This signal can be useful for actuating mechanical brakes
orfor monitoring an axis status. An axis is inhibited if the host bus interlock
circuitry is activated,if the ENABLE switch on the front panel is in the
inhibit position, if the motion controller’s inhibit signal is low,or if the
per-axisinhibit input isactively driven.
TheMID-7604/7602 stepper drive remains in a reset state for 500 ms after
the inhibit is deasserted. Therefore, you can lose steps if you attempt to
issue astart mo tion command within 500 ms from the deassertion of the
stepper driveinhibit. A Kill command asserts theinhibit signal from the
controllerand a Haltcommand deasserts the inhibit signal from the
controller.The yellow LEDs (middle row) on the front panel illuminate if
anax isi scur rently inhibited (killed state). Execute a halt stop to de-assert
the inhibit signal from the controller, after which you must wait at least
500 ms before executinga start.
Breakpoint and TriggerTerminal Blocks
Boththe breakpoint and trigger connectors use a 6-pin removable terminal
block.
The triggert erminal block providesaccess to the trigger input lines,
shutdowninput line, and digital ground. The breakpoint terminal block
providesaccess to the breakpoint output lines, +5 V supplied by the
MID-7604/7602, and digital ground. Figures 11 and 12 show the
breakpoint and trigger 6-position terminal block assignments.
1
6
2
3
4
5
ForwardLimit
HomeInput
InhibitInput
DigitalGround
ReverseLimit
InhibitOutput