Omron CQM1-ARM21 Operation Manual page 27

Physical Layout of the Unit
! WARNING
The master cannot address any slave beyond the highest AS-I slave
address, in any operation mode.
Not every CQM1 CPU supports all possible switch settings. To deter-
mine the allowed settings, check the CQM1/CPM1 Programming
manual ( W228-E1) to verify the number of I/O points available to each
CPU type, and take any additional I/O units to be mounted into con-
sideration.
If the selected number of I/O words exceeds the maximum amount
available in the CQM1 system, the CPU's RUN indicator will remain
OFF, and an I/O UNIT OVER error will be indicated. Reduce the num-
ber of allocated I/O words or select a CPU type with larger I/O capac-
ity. (See also 4-1, PLC Settings)
The CH switch settings should only be changed when the PLC power
is OFF. Changing the positions of switches 1-3 while the PLC power is
ON can result in an I/O BUS error in the CPU.
RSV Reserved. Keep this switch in OFF position.
MOD Selects the operation mode of the AS-Interface master.
OFF Configuration Mode / Setup Mode.
In Configuration Mode the AS-Interface master will exchange
I/O data with any slave with a non-zero address on the network.
In Setup Mode, I/O data exchange between PLC CPU and
ARM21 is partially suspended to allow configuration commands
to be processed.
ON Protected Mode.
The AS-Interface master will only exchange I/O data with slaves
that have been registered in the permanent configuration.
OFF → ON A change from OFF to ON stores the actual, detected
SET
configuration as permanent configuration data. The permanent
configuration data consists of all active slaves' addresses, I/O
codes, ID codes, and parameter data, and is stored in non-
volatile memory (EEPROM) in the CQM1-ARM21.
This function is only available if the unit is not in Protected
Mode, i.e. in Configuration Mode or Setup Mode (CM LED is
ON). In Protected Mode, no specific action is performed.
ON → OFF : no specific action in any operation mode.
Section 2-1
13