6
FUNCTIONS
6.6 Checking the ROM write count
6
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6.6 Checking the ROM write count
The ROM write count is up to 100,000.
When the ROM write count exceeds 100,000, the continuation error "EXCEED MAX
FLASH ROM REWRIT. ERR." (error code: 1610) occurs.
When the [EXCEED MAX FLASH ROM REWRIT. ERR.] (error code: 1610) occurs, the
CPU may not write to the ROM, which needs to replace the CPU module.
(1) Method for checking the ROM write count
The ROM write count is stored in special registers SD232 and SD233.
The current ROM write count can be checked by monitoring special registers SD232
and SD233.
Also, if the ROM write count exceeds 100,000, special relay SM232 turns ON.
(2) Operation counted as ROM writes
Below are the operations counted as a ROM write.
(a) Writing parameters or program to the standard ROM
There are two types of writing parameters and programs to ROM
• Writing program memory to ROM using GX Developer
• Writing program memory to ROM when switching from TEST MODE to
SAFETY MODE
(b) Registering the CPU access password from GX Developer
(c) PLC memory initialization
POINT
1. The following shows the count value at the time of writing to ROM.
• Writing the program memory to ROM:6
• Registration/change of the CPU access password from GX developer :2
• PLC memory initialization:2
2. At the factory, the OS etc. are written to the ROM of the safety CPU module.
Therefore, the ROM write count is increased by the number of ROM writes at
the factory.
Table6.10 ROMwrite count check special relay and special registers
Special relay,
special register
number
Description
Remark
SM232
Turns ON if the ROM write count exceeds
100,000.
-
SD232
The ROM write count is stored as a binary value.
The ROM write count continues to be
stored even if it exceeds 100,000.
SD233
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