Rockwell Automation 1755-OF8 GuardPLC Controller Systems - Manual (Page 84)

84 Publication 1753-UM001C-EN-P - March 2010
Chapter 8 Wire and Configure the 1753-IB16XOB8 Module
supply is read and the supply is switched off if an overcurrent
condition occurs. This supply is protected by a current limiting device.
Follow the closed-circuit principle for external wiring when
connecting sensors. To create a safe state in the event of a fault, the
input signals revert to the de-energized state (0). Although the
external line is not monitored, a wire break is interpreted as a safe
0-signal. Unused inputs must not be terminated.
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.
L+ Not Buffered L+ Not Buffered L+ Buffered L+ Buffered
Current
Limiting
40 mA
Current
Limiting
40 mA
Current
Limiting
40 mA
Current
Limiting
40 mA
Current
Limiting
1 A
Current
Limiting
1 A
LS+ LS+ LS+ LS+ LS+ LS+ LS+ LS+
33 34 43 44 53 54 63 64 Terminal Number