USER GUIDE
MCA-7724 MOTION AXIS ROUTER
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.
CONTROLLER CONNECTOR
MOTION I/O
Front
ACCESSORY CONNECTORS
<
2 + 2
>
CONNECTOR A
CONNECTOR B
<
3 + 1
>
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
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3 + 1 Connectivity Option
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 2 Signals
Axis 3 Signals
Shared Signals
Signals
Signals
Controller
Connector
1
Axis
Axis 1 Signals
Axis 2 Signals
Axis 3 Signals
Shared Signals
Axis 4 Signals
2
Axis
Signals
3
Connector
C
Axis
Connector
D
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.
Note 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
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Shared Signals from the Controller
Host +5V
Digital Ground
Analog Input Ground
Analog Output Ground
Analog Reference (Output)
Shutdown
Note Some signals may not be available on your controller. Please consult your controller
user manual for signal connection information.
Caution Shared signals are available at all four accessory connectors. Use caution to avoid
double driving input signal shutdown.
Software Configuration
Because of signal rerouting, the axis number on your accessory may not
match the programmed axis in your software. With the 2 + 2 connectivity
option, the accessory connected to connector B will refer to the axes as
axis 1 and axis 2, but will be programmed as axis 3 and axis 4, respectively,
in your software. With the 3 + 1 connectivity option, the accessory
connected to connector D will refer to the axis as axis 1 but will be
programmed as axis 4 in your software.
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Connecting Your Adapter
This section provides the pin assignments for each of the MCA-7724
connectors.
Figure 4 shows the pin assignments for the controller connector.
1
2
3
4
5
6
7
8
9
35
36
37
38
39
40
41
42
43
Axis 1 Dir (CCW)
Digital Ground
Digital Ground
Axis 1 Home Switch
Trigger 1
Axis 1 Step (CW)
Axis 1 Encoder Phase A
Axis 1 Encoder Phase B
Axis 1 Encoder Index
Axis 1 Forward Limit Switch
Axis 1 Reverse Limit Switch
Axis 2 Step (CW)
Axis 1 Inhibit
Axis 2 Dir (CCW)
Digital Ground
Digital Ground
Axis 2 Home Switch
Axis 2 Encoder Phase A
Axis 2 Encoder Phase B
Axis 2 Encoder Index
10 44
Trigger 2 11 45
Axis 2 Forward Limit Switch
Axis 2 Reverse Limit Switch
Axis 3 Step (CW)
Axis 2 Inhibit
12 46
13 47
14 48
Axis 3 Dir (CCW)
Digital Ground
Axis 3 Encoder Phase A
Axis 3 Encoder Phase B
Axis 3 Encoder Index
Digital Ground 15 49
16 50
17 51
18 52
19 53
20 54
Axis 3 Home Switch
Trigger 3
Axis 3 Forward Limit Switch
Axis 3 Inhibit
Axis 3 Reverse Limit Switch
Axis 4 Dir (CCW)
Digital Ground
Axis 4 Step (CW)
Axis 4 Encoder Phase A
Digital Ground 21 55
Axis 4 Home Switch 22 56
Trigger 4 23 57
Axis 4 Encoder Phase B
Axis 4 Encoder Index
Axis 4 Forward Limit Switch
Axis 4 Reverse Limit Switch
Host +5 V
Axis 4 Inhibit
24 58
25 59
Digital Ground
Breakpoint 1 26 60
Breakpoint 3
Digital Ground 28 62
Analog Output 1
Analog Output 3 30 64
Breakpoint 2
27 61
Breakpoint 4
Shutdown
29 63
Analog Output 2
Analog Output 4
Reserved
Analog Output Ground
31 65
Analog Input 1 32 66
Analog Input 2
Analog Input 3 33 67
Analog Input 4
Analog Reference (Output) 34 68
Analog Input Ground
Figure 4. 68-Pin Controller Connector Pin Assignments
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Figure 5 shows the pin assignments for connector A.
1
2
3
4
5
6
7
8
9
35
36
37
38
39
40
41
42
43
Axis 1 Dir (CCW)
Digital Ground
Digital Ground
Axis 1 Home Switch
Trigger 1
Axis 1 Step (CW)
Axis 1 Encoder Phase A
Axis 1 Encoder Phase B
Axis 1 Encoder Index
Axis 1 Forward Limit Switch
Axis 1 Reverse Limit Switch
Axis 2 Step (CW)
Axis 2 Encoder Phase A
Axis 2 Encoder Phase B
Axis 2 Encoder Index
Axis 2 Forward Limit Switch
Axis 2 Reverse Limit Switch
NC
Axis 1 Inhibit
Axis 2 Dir (CCW)
Digital Ground
Digital Ground
Axis 2 Home Switch
10 44
Trigger 2 11 45
Axis 2 Inhibit
12 46
13 47
14 48
NC
NC
Digital Ground
Digital Ground 15 49
NC
16 50
17 51
18 52
19 53
20 54
NC
NC
NC
NC
NC
NC
NC
NC
NC
Digital Ground
Digital Ground 21 55
NC 22 56
NC
NC
NC 23 57
NC
NC
24 58
25 59
NC
Digital Ground
Host +5 V
Breakpoint 2
NC
Breakpoint 1 26 60
NC
Digital Ground 28 62
Analog Output 1
NC 30 64
27 61
Shutdown
Analog Output 2
NC
29 63
Analog Output Ground
31 65
Analog Input 1 32 66
Reserved
Analog Input 2
NC
NC 33 67
Analog Reference (Output) 34 68
Analog Input Ground
Figure 5. 68-Pin Connector A Pin Assignments
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Figure 6 shows the pin assignments for connector B.
1
2
3
4
5
6
7
8
9
35
36
37
38
39
40
41
42
43
Axis 3 Dir (CCW)
Digital Ground
Digital Ground
Axis 3 Home Switch
Trigger 3
Axis 3 Step (CW)
Axis 3 Encoder Phase A
Axis 3 Encoder Phase B
Axis 3 Encoder Index
Axis 3 Forward Limit Switch
Axis 3 Reverse Limit Switch
Axis 4 Step (CW)
Axis 4 Encoder Phase A
Axis 4 Encoder Phase B
Axis 4 Encoder Index
Axis 4 Forward Limit Switch
Axis 4 Reverse Limit Switch
NC
Axis 3 Inhibit
Axis 4 Dir (CCW)
Digital Ground
Digital Ground
Axis 4 Home Switch
10 44
Trigger 4 11 45
Axis 4 Inhibit
12 46
13 47
14 48
NC
NC
Digital Ground
Digital Ground 15 49
NC
16 50
17 51
18 52
19 53
20 54
NC
NC
NC
NC
NC
NC
NC
NC
NC
Digital Ground
Digital Ground 21 55
NC 22 56
NC
NC
NC 23 57
NC
NC
24 58
25 59
NC
Digital Ground
Host +5 V
Breakpoint 4
NC
Breakpoint 3 26 60
NC
Digital Ground 28 62
Analog Output 3
NC 30 64
27 61
Shutdown
Analog Output 4
NC
29 63
Analog Output Ground
31 65
Reserved
Analog Input 4
NC
Analog Input 3 32 66
NC 33 67
Analog Reference (Output) 34 68
Analog Input Ground
Figure 6. 68-Pin Connector B Pin Assignments
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Figure 7 shows the pin assignments for connector C.
1
2
3
4
5
6
7
8
9
35
36
37
38
39
40
41
42
43
Axis 1 Dir (CCW)
Digital Ground
Digital Ground
Axis 1 Home Switch
Trigger 1
Axis 1 Step (CW)
Axis 1 Encoder Phase A
Axis 1 Encoder Phase B
Axis 1 Encoder Index
Axis 1 Forward Limit Switch
Axis 1 Reverse Limit Switch
Axis 2 Step (CW)
Axis 1 Inhibit
Axis 2 Dir (CCW)
Digital Ground
Digital Ground
Axis 2 Home Switch
Axis 2 Encoder Phase A
Axis 2 Encoder Phase B
Axis 2 Encoder Index
10 44
Trigger 2 11 45
Axis 2 Forward Limit Switch
Axis 2 Reverse Limit Switch
Axis 3 Step (CW)
Axis 2 Inhibit
12 46
13 47
14 48
Axis 3 Dir (CCW)
Digital Ground
Axis 3 Encoder Phase A
Axis 3 Encoder Phase B
Axis 3 Encoder Index
Digital Ground 15 49
16 50
17 51
18 52
19 53
20 54
Axis 3 Home Switch
Trigger 3
Axis 3 Forward Limit Switch
Axis 3 Inhibit
NC
Axis 3 Reverse Limit Switch
NC
NC
Digital Ground
Digital Ground 21 55
NC 22 56
NC
NC
NC 23 57
NC
NC
24 58
25 59
NC
Digital Ground
Host +5 V
Breakpoint 2
NC
Breakpoint 1 26 60
Breakpoint 3
Digital Ground 28 62
Analog Output 1
Analog Output 3 30 64
27 61
Shutdown
Analog Output 2
NC
29 63
Analog Output Ground
31 65
Analog Input 1 32 66
Reserved
Analog Input 2
NC
Analog Input 3 33 67
Analog Reference (Output) 34 68
Analog Input Ground
Figure 7. 68-Pin Connector C Pin Assignments
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Figure 8 shows the pin assignments for connector D.
1
2
3
4
5
6
7
8
9
35
36
37
38
39
40
41
42
43
Axis 4 Dir (CCW)
Digital Ground
Digital Ground
Axis 4 Home Switch
Trigger 4
Axis 4 Step (CW)
Axis 4 Encoder Phase A
Axis 4 Encoder Phase B
Axis 4 Encoder Index
Axis 4 Forward Limit Switch
Axis 4 Inhibit
NC
Axis 4 Reverse Limit Switch
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
Digital Ground
Digital Ground
NC
10 44
NC 11 45
NC
12 46
13 47
14 48
NC
Digital Ground
Digital Ground 15 49
16 50
17 51
18 52
19 53
20 54
NC
NC
NC
NC
NC
NC
NC
Digital Ground
Digital Ground 21 55
NC 22 56
NC
NC
NC 23 57
NC
NC
24 58
25 59
NC
Digital Ground
Host +5 V
Breakpoint 4 26 60
NC
Digital Ground 28 62
Analog Output 4
NC 30 64
NC
27 61
NC
Shutdown
29 63
NC
NC
Analog Output Ground
31 65
Analog Input 4 32 66
Reserved
NC
NC 33 67
NC
Analog Reference (Output) 34 68
Analog Input Ground
Figure 8. 68-Pin Connector D Pin Assignments
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