Functions Added To Qcpu-A; Boot Operation From Built-In Rom - Mitsubishi Electric MELCEC Q Series User Manual

4. CPU MODULE
4.4

Functions added to QCPU-A

This section describes the new functions added to QCPU-A (A mode) which are not
available with A2USHCPU-S1.
4.4.1

Boot operation from built-in ROM

Boot operation can be performed by booting parameters and sequence programs from the
built-in ROM to the built-in RAM at start-up.
The boot operation from the built-in ROM allows the retention of sequence programs
without using batteries even when the power is off.
The following shows the procedure for the boot operation from the built-in ROM:
(1) Operation methods
There are two methods to operate QCUP-A: The RAM operation uses the built-in
RAM. The boot operation uses the built-in ROM and boots parameters and sequence
programs from the built-in ROM to the built-in RAM at start-up.
QCPU-A allows checking the current operation method by setting DIP switch 3 and
M9073. The following table shows the setting combination.
Status of DIP switch 3
RAM operation
OFF
RAM operation
ON
(a) Procedure for boot program (at start-up only)
How to boot program from the built-in ROM to the built-in RAM
1) Set DIP switch 3 to ON.
2) Turn on or reset the power supply. (BOOT LED turns on.)
(b) Procedure for write to built-in ROM
How to write a program from built-in RAM to built-in ROM
1) Set DIP switch 3 to ON and turn on M9073
is stored in M9076.
2) Start writing to the built-in ROM. (M9074 is turned on.)
3) When writing to the built-in ROM is successfully completed, M9075 turns on
and D9075 stores the result of writing to the built-in ROM operation.(M9074 is
turned on.)
4) To repeat writing, turn off M9074 once and turn it on again.
(When M9074 is turned off, M9075 is turned off.)
Status of M9073
OFF
D9076: 0
M9076: OFF
D9076: 1
M9076: OFF
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ON
RAM operation
D9076: 0
M9076: OFF
Boot operation from built-in ROM
D9076: 2
M9076: ON
(Writing available with built-in
ROM)
"2" is stored in D9076 and "1"