National Instruments MCA-7724 User Manual
USER GUIDE
MCA-7724 M
Introduction
The MCA-7724 Motion Axis Router reroutes the signals from your motion
controller into separate connectors that connect to different motion
accessories. The router allows you to connect one, two, three, and four axis
drives and accessories to a controller.
Features
The MCA-7724 Motion Axis Router has five 68-pin VHDCI connectors:
the controller connector, connector A, connector B, connector C, and
connector D. Figure 1 shows the five connectors.
OTIONAXIS
R
OUTER
CONTROLLER CONNECTOR
MOTION I/O
Front
ACCESSORY CONNECTORS
<
CONNECTOR A
<
CONNECTOR C CONNECTOR D
Back
Figure 1. MCA-7724 Motion Axis Router Connectors
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322835A-01 Copyright © 2001 National Instruments Corp. All rights reserved. April 2001
2+2
3+1
>
CONNECTOR B
>
Connectivity Options
The controller connector on the MCA-7724 Motion Axis Router connects
to the 68-pin motion I/O connector on your controller. The adapter then
reroutes signals from the motion I/O connector to the accessory connectors
on the MCA-7724 Motion Axis Router. You can connect motion drives and
accessories in a 2 + 2 connectivity option or a 3 + 1 connectivity option.
Figures 2 and 3 show the two connectivity options.
Caution
Connect motion drives and accessories only to connectors A and B (2 + 2
connectivity option) or to connectors C and D (3 + 1 connectivity option). Failure to
connect the motion drives and accessories as shown in Figures 2 and 3 may result in
damage to the motion controller, axis router, drive, or accessory.
2+2ConnectivityOption
Controller axes 1 and 2 from the controller correspond to axes 1 and 2 on
connectorA,andcontrolleraxes3and4correspondtoaxes1and2on
connector B, as shown in Figure 2.
Axis 1 Signals
Axis 2 Signals
Shared Signals
Shared Signals
Axis 1 Signals
Axis 1 Signals
Axis 2 Signals
Shared Signals
Axis 3 Signals
To Controller
Axis 4 Signals
Controller
Connector
Axis 1 Signals
Axis 2 Signals
Shared
Signals
Axis 3 Signals
Axis 4 Signals
Connector
A
Connector
B
To Drive/AccessoryTo Drive/Accessory
Axis 2 Signals
Figure 2. 2 + 2 Connectivity Option
MCA-7724 Motion Axis Router 2 ni.com
3+1ConnectivityOption
Controller axes 1, 2, and 3 correspond to axes 1, 2, and 3 on connector C,
and controller axis 4 corresponds to axis 1 on connector D, as shown in
Figure 3.
Axis 1 Signals
Axis 1 Signals
Axis 2 Signals
Axis 3 Signals
Shared Signals
To Controller
Axis 4 Signals
Note
Controller
Connector
Axis 1 Signals
Axis 2 Signals
Axis 3 Signals
Shared
Signals
Axis 4 Signals
Connector
C
Connector
D
Axis 2 Signals
Axis 3 Signals
Shared Signals
Shared Signals
Axis 1 Signals
Figure 3. 3 + 1 Connectivity Option
Axis Signals
The per axis and shared signals from the controller are listed below.
A line above the signal name indicates that the signal is active-low.
Per Axis Signals from the Controller
Step (CW)
Dir (CCW)
Encoder Phase A
Encoder Phase B
Encoder Index
Forward Limit Switch
Reverse Limit Switch
Home Switch
Trigger
Breakpoint
Inhibit
Analog Output
Analog Input
To Drive/Accessory
To Drive/Accessory
© National Instruments Corporation 3 MCA-7724 Motion Axis Router
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