Download Modicon M580 - Hardware - Reference Manual

Modicon M580 Racks
In a local rack, as many as 7 extender racks of X80 may be added (see page 59).
Switch
Rack Address
0
1
2
3
4
5
6
7
1
OFF
OFF
OFF
OFF
2
OFF
OFF
ON
ON
ON
ON
ON
ON
OFF
OFF
ON
ON
3
OFF
ON
OFF
ON
OFF
4
Not used
ON
OFF
ON
By default, the rack extender module is shipped with the switches set to address 0 (all switches
OFF). Address 0 is reserved for only the main local rack (which contains the CPU). The remaining
X80 racks in an extension may be assigned addresses 1 through 7 in any order or sequence. The
key requirement when you set the X80 rack addresses is that each address is unique with respect
to all other rack addresses in the extension.
NOTE:
You create a condition called a collision if you:
 assign the same rack address to more than one X80 rack in an extension
 assign address 0 to any rack other than the main local rack
When a collision happens, one of the racks with the duplicate rack address will not operate.
To recover from a collision:
Step
Action
1
Turn OFF the power supplies in the racks that have the address mismatch.
2
Using the address switches on the rack extender module, set unique and
correct rack addresses.
3
Reapply power to the racks.
Rack Extender LEDs
The LEDs on the rack extender module provide status information about the rack in which it
resides:
EIO0000001578 10/2013
63