Installation Instructions User guide

GuardPLC 8-Digital Inputs and 8-Digital Outputs Module 11

Publication 1753-IN010A-EN-P - October 2005

Digital Input Terminals

See page 18 for the appropriate wire size. Digital inputs are connected to the

following terminals:

LS+, not L+, should be used for short-circuit protection. Each LS+ features individual

short-circuit and EMC protection that make it important to use LS+ for only it’s four

related inputs.

Surge on Digital Inputs

An EN 61000-4.5 surge impulse can be read as a short-time HI signal. To avoid an

error:

• install shielded input lines to prevent effects of surges in the system, or

• implement software filtering in the user program. A signal must be present

for at least two cycles before it is used by the rest of the logic in the user

program.

Terminal Number Designation Function

19 LS+ Sensor supply for inputs 1 to 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 to 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

1LS+ L-

234

19 20 21 22 23 24

LS+ 5 L-

678

25 26 27 28 29 30