Memory Write-Protect Setting For An A2Snmca-30Ke - Mitsubishi A1SJH User Manual

7. MEMORY CASSETTE AND BATTERY
7.1.5

Memory write-protect setting for an A2SNMCA-30KE

When an A2SNMCA-30KE is installed on an A2SHCPU, misuse of peripheral
devices can cause the E
from occurring, the A2SNMCA-30KE has been provided with a memory write-
protect setting.
When the memory write-protect setting pin is in the ON position, all 64 k bytes of
the user memory area will be protected.
The memory write-protect setting pin must be moved to the OFF position in order to
allow the contents of the ROM memory to be corrected.
The pin is set to the OFF position before shipment from the factory.
See Section 4.1.9 regarding memory area allocation.
Memory protection
setting pin
A2SNMCA-30KE
2
PROM memory to be over-written. In order to prevent this
OFF ON
M.PRO
Shows the memory
protection canceled state.
7 - 6
MELSEC-A
Jumper