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Wire:
Enable
I/O_Com
Home
Pos
Otrav
Neg
Otrav
Reg_Com
Reg_1
Reg_2
Allen-Bradley PLCs
I/O Signal Descriptions
The following table provides a description of the various discrete
input signals, as shown in Figure 2.20.
Description:
A 24V DC input is applied to these terminals to enable
each axis.
Common grounding point for input signals (Home, Enable,
Pos/Neg_Otrav)
Home switch (normally open contact) inputs for each axis
require 24V DC (nominal), 15 mA (max) to energize. Each
input is optically isolated and filtered to minimize switch
bounce. Refer to Figure 2.21.
The positive limit switch (normally closed contact) inputs
for each axis require 24V DC (nominal), 15 mA (max) to
energize. Each input is optically isolated and filtered to
minimize switch bounce. Refer to Figure 2.21.
The negative limit switch (normally closed contact) inputs
for each axis require 24V DC (nominal), 15 mA (max) to
energize. Each input is optically isolated and filtered to
minimize switch bounce. Refer to Figure 2.21.
24V DC high-speed, optically-isolated filtered registration
input for each axis.
1
Optional if not configured in RSLogix 5000 axis configuration.
Figure 2.21
Home and Travel Fault Inputs
(Axis 0)
Home
2
Pos_Otrav
5
Neg_Otrav
6
I/O_Com
7
Note: Similar for Axis 1, 2, and 3.
Figure 2.22
Typical Registration Input
Reg_1
4
Reg_Com
3
+
24V DC
Note: Similar for Reg_2 input.
Connecting Your 1394 SERCOS Interface System
Connector:
Axis 0-3 input pin 1
Axis 0-3 input pin 7
Axis 0-3 input pin 2
Axis 0-3 input pin 5
Axis 0-3 input pin 6
Axis 0-3 input pin 3
Axis 0-3 input pin 4
Axis 0-3 input pin 8
24V DC
Output
Registration
Common
Device
Supply
2-29
Mandatory
or
Optional:
Mandatory
Mandatory
1
Optional
1
Optional
1
Optional
1
Optional
Publication 1394-5.20 — July 2001
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