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8 PROGRAMMING
MELSEC-QnA
8.2 Precautions for Registering Parameters to E
2
PROM
This section explains the precautions for registering parameters to E
2
PROM.
This section may be read by only those who will use the module indicated in Section
8.2.1 and register parameters to E
2
PROM more than 127 times without switching
power off or resetting the CPU.
The number of times when parameters can be registered to E
2
PROM is cleared by
switching power off or resetting the CPU.
8.2.1 Target module and versions
The target module and versions are as indicated below.
Target Module Hardware version Software version
A1SJ61QBT11 H or later E (manufactured in Aug., 2001) or later
8.2.2 Precautions
The following are the precautions for registering parameters to E
2
PROM.
(1) The number of times when parameters can be registered to E
2
PROM
consecutively without switching power off or resetting the CPU is up to 127.
(2) The link special register (SW00BB) stores the number of times when
parameters can be registered to E
2
PROM.
(3) When the number of times when parameters can be registered to E
2
PROM is
zero, turn on the E
2
PROM erasure request (YnD) after a data link stop to
erase the parameters in the E
2
PROM.