Safety-related digital outputs, Terminal connections surge on digital inputs, Terminal connections – Rockwell Automation 1755-OF8 GuardPLC Controller Systems User Manual
Page 78: Surge on digital inputs

78
Publication 1753-UM001C-EN-P - March 2010
Chapter 7 Wire and Configure the 1753-IB8XOB8 Module
Terminal Connections
See the wire size and terminal torques specifications on page
.
Digital inputs are connected to these terminals.
Surge on Digital Inputs
An EN 61000-4.5 surge impulse can be read as a short-duration HI
signal in some modules. To avoid an error, either:
•
install shielded input lines to prevent effects of surges in the
system.
•
implement software filtering in the user program. A signal must
be present for at least two cycles before it is evaluated.
Safety-related Digital
Outputs
The module has 8 positive-switching digital outputs that switch
+24V DC and two negative-switching digital outputs that switch
24V COM. Their status is indicated via status indicators.
The positive and negative-switching digital outputs can be connected
in a one-pole or two-pole manner.
If configured for one-pole operation, use the reference pole L- for the
positive-switching outputs and reference pole S+ for the
Terminal Number
Designation
Function
19
LS+
Sensor supply for inputs 1… 4
20
1
Digital input 1
21
2
Digital input 2
22
3
Digital input 3
23
4
Digital input 4
24
L-
Reference pole
25
LS+
Sensor supply for inputs 5 …8
26
5
Digital input 5
27
6
Digital input 6
28
7
Digital input 7
29
8
Digital input 8
30
L-
Reference pole
1
LS+
L-
DI
2 3 4
19 20 21 22 23 24
19 20 21 22 23 24
LS+ 5
L-
DI
6 7 8
25 26 27 28 29 30
25 26 27 28 29 30
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