SIMATIC S7-200/300/400, Step7, PCS7, CFC, SFC, PDM, PLCSIM,
SCL, Graph, SPS-VISU S5/S7, IBHsoftec, LOGO ...
-
kambiz
- Posts: 121
- Joined: Sat Dec 09, 2006 5:04 am
- Location: Iran
Post
by kambiz »
hi
i need some advice, so help me if someone can!
i use analog input AIW0 from analog module EM235. Signal on the input AIW0 is 0(4) ... 20 mA (0...32000), but that signal is unstable!
-
Coyote
- Posts: 41
- Joined: Wed Sep 06, 2006 10:07 am
- Location: Slovenia
Post
by Coyote »
So, what's up. You should make the signal stable, there is no other way. You can also apply filter for analog signals (see the system block).
-
dsekulic
- Posts: 186
- Joined: Sun Feb 12, 2006 5:47 pm
- Location: Europe
Post
by dsekulic »
Hi,
Maybe You have some interference in vicinity of measuring system. Do You You use screened cable?
regards
-
xdoit
- Posts: 36
- Joined: Wed Nov 21, 2007 2:13 pm
- Location: China
Post
by xdoit »
hi,
You should use STP (Shielded Twisted Pair) cable for that sensor and make sure only one end to be connect to earth.
rgds,
hsiung