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4.
SETTINGS AND PROCEDURES BEFORE OPERATION
MELSEC-A
(4)
LEDs CIN (LED Nos. 11) above light in the following circumstances:
(a) When the AlSJ71C24 attempts to make an illegal access while the
PC CPU is running (a write during program execution, for example).
(b) During abnormal PC CPU access.
(5)
The "initial state" column indicates the status when the power is turned
ON the PC CPU is reset or when the READY signal of the AlSJ71C24
is turned ON after the mode was switched.
4.3
Settings
This section describes the setting methods and explains the settings of the
transmission control protocol and communications specifications (data
length, sum check, etc.).
After changing the settings, turn the PC CPU power supply OFF and back
ON, or reset the PC CPU.
a
4.3.1
Setting the dedicated protocol, no-protocol mode, bidirectional mode or printer function
(1) The method of setting the transmission control protocol and the meaning
of the switch settings are described in the table below.
When the mode switch is set to
"5"
and the bidirectional mode setting
area in the buffer memory is set to " I " , the no-protocol mode in the
following table changes to the bidirectional mode.
All mode settings in the following table are in the no-protocol mode.
or Printer function
POINT]
Sections 2.3.1 to 2.3.2 give the examples of settings with different system
configurations.
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