Rockwell Automation 1398-DDM-xxx USE MNL/ULTRA 200 DIG.SERVO.DR - Manual (Page 85)

Publication 1398-5.0 – October 1998
Interfaces 6-21
Interface Cable Examples
The use of differential signals is highly recommended. This is due to
the immunity of differential signals to common mode interference.
Single-ended encoder interface circuits are not recommended, and
may result in system malfunction.
To improve noise immunity, a cable shield should terminate at both
ends of the cable. Shields should connect to the backshell of the
connectors with termination around the full circumference (360°). The
connectors should attach to chassis ground (not signal common).
Figure 6.23 External Encoder Interface via TTL Differential Line Drivers
Figure 6.24 Complementary Encoder Interface via 7406 Line Drivers
with Pull-up Resistors
Ch A
ENCODER
AX+
AX- 14
15
J1 Drive
twisted pair
Ch B
BX+
BX- 16
17
twisted pair
Ch I
IX+
IX- 18
19
twisted pair
Drive Chassis
Encoder Case
2
4
+5V
Supply
Return
+5 Volts
1
3
+5V
Supply
+5VDC
5V @ 250 mA
ECOM
twisted pair
For horizontal dashed lines,
connect only if J1 sources Encoder power
ENCODER J1 Drive
Ch B
BX+
BX- 16
17
twisted pair
Drive Chassis Encoder Case
+5 Volts
7406
Ch A
AX+
AX- 14
15
+5 Volts
7406
Ch I
IX+
IX- 18
19
+5 Volts
7406
twisted pair
twisted pair
twisted pair
2
4
+5V
Supply
Return
+5 Volts
1
3
+5V
Supply
+5VDC
5V @ 250 mA
ECOM
For horizontal dashed lines,
connect only if J1 sources Encoder power