Hardware reference guide

CPU Modules
168
35013379 11/2011
The CPU43412A has 1435KByte of Flash EPROM memory, which can be used to
save the program and the initial values of variables. On power up, if you have a
program in flash memory, you can choose the desired operating mode using the
PLC MEM switch on the processor front panel. The 140CPU43412A has a key
switch with Run, Mem Prt, and Stop positions.
Rear Panel Address Switch
The following figure shows the SW1 and SW2 settings for the Address Switch
located on the rear panel.
SW1 sets the upper digit (tens) of the address. SW2 sets the lower digit (ones) of
the address. The following table shows the SW1 and SW2 address settings.
NOTE: If "0" or an address greater than 64 is selected, the Modbus + LED will be
"on" steady, to indicate the selection of an invalid address.
Stop position The application in Flash is not transferred to internal RAM: warm
restart of the application.
Mem Prt position The application in Flash is not transferred to internal RAM: warm
restart of the application.
Start position The application in Flash is automatically transferred to internal
RAM when the PLC processor is powered up: cold restart of the
application.
SW1 and SW2 Address Settings
Node Address SW1 SW2
1 ... 9 0 1 ... 9
10 ... 19 1 0 ... 9
20 ... 29 2 0 ... 9
30 ... 39 3 0 ... 9
40 ... 49 4 0 ... 9
50 ... 59 5 0 ... 9
60 ... 64 6 0 ... 4