Siemens SIMATIC ET 200AL - Page 612

Setting and determining system diagnostics
4.2 Options for displaying system diagnostics
Diagnostics
Function Manual, 09/2016, A5E03735838-AD
27
4.2.1
Diagnostics information at the devices
4.2.1.1
LEDs
Overview
All hardware components, such as CPUs, interface modules and modules, provide
information about their operating mode as well as internal and external errors through their
LEDs. Diagnostics by means of LEDs is an initial tool for error localization.
The graphics below include examples for the arrangement of LEDs on some modules.
Table 4- 1 LED displays on the modules
CPU 1516-3 PN/DP
IM 155-5 PN ST
DI 32x24VDC HF
PS 25W 24VDC
①
RUN/STOP LED
(two-colored LED: green/yellow)
RUN LED
(two-colored LED:
green/yellow)
RUN LED
(single-colored LED:
green)
RUN LED
(single-colored LED:
green)
②
ERROR LED
(single-colored LED: red)
ERROR LED
(single-colored LED: red)
ERROR LED
(single-colored LED: red)
ERROR LED
(single-colored LED: red)
③
MAINT LED
(single-colored LED: yellow)
MAINT LED
(single-colored LED:
yellow)
without function MAINT LED
(single-colored LED:
yellow)
④
X1 P1
(two-colored LED:
green/yellow)
X1 P1
(single-colored LED:
green)
LED CHx
(two-colored LED:
green/red)
⑤
X1 P2
(two-colored LED:
green/yellow)
X1 P2
(single-colored LED:
green)
⑥
X2 P1
(two-colored LED:
green/yellow)