Description of the I/O Modules  LION System 
EN1Z-0921GE51 R0709     
40
Description of the I/O Modules 
Common Features 
Switches located on the Terminal Socket 
Feature  Function 
Service 
button S1 
(pluggable I/O 
modules, 
only) 
•  LED test, see section "Troubleshooting" 
on page 74 
• LONWORKS service button functionality 
for L
ONWORKS Bus I/O modules 
Hex switch 
S2 
•  Module addressing for Panel Bus 
I/O modules 
 
LEDs located on the I/O Module 
Feature  Function 
Service LED 
(yellow) 
•  Service information, see section 
"Troubleshooting" on page 74 
Power LED 
(green) 
•  Information on power supply, see 
section "Troubleshooting" on page 74  
 
For the location of these elements, see figures of the 
relative modules. 
 
 
Analog Input Modules 
Types of Analog Input Modules and Terminal 
Socket 
Type  Description  Housing 
CLIOP821 
Panel Bus analog input 
module 
Light gray 
CLIOL821 
L
ONWORKS Bus analog input 
module 
Dark gray 
XS821-822 
XSU821-822 
Terminal socket  Light gray 
Table 42  LION Analog Input Modules 
 
Features 
•  8 analog inputs 
•  Sensor-break and short-circuit detection, see section 
"Troubleshooting" on page 74. 
 
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Fig. 58  CLIOP821A Analog Input Module with terminal 
socket 
Legend 
 1  Service button S1 
  2  Hex switch S2 
 3  Service LED 
 4  Power LED 
 
Functionality of service LED and power LED: see Table 77 
to Table 79 on page 78 and following.