Introduction
SECTION 1
6
1-3
3G3MV-P10CDT Structure and Operation
1-3-1
3G3MV-P10CDT Structure
The following diagram shows the internal structure of the Unit.
In
put ci
rc
uits
I/O memory
PC Setup
Output c
ircui
ts
External
input
devices
External
output
devices
Inverter
interface
3G3MV
Inverter
Communications
Switches
Program
Settings
Settings
Communications
ports
Settings
I/O Memory
The program reads and writes data in this memory area during execution.
Part of the I/O memory contains the bits that reflect the status of the PLC’s
inputs and outputs. Parts of the I/O memory are cleared when the power is
turned ON and other parts are retained.
Program
This is the program written by the user. The 3G3MV-P10CDT executes the
program cyclically. (Refer to section
1-3-4 Cyclic Operation and Interrupts
for
details.) The program can be divided broadly into two parts: the “main pro-
gram” that is executed cyclically and the “interrupt programs” that are exe-
cuted only when the corresponding interrupt is generated.
PLC Setup
The PLC Setup contains various startup and operating parameters. The PLC
Setup parameters can be changed from a Programming Device only; they
cannot be changed from the program.
Some parameters are accessed only when PLC’s power supply is turned ON
and others are accessed regularly while the power is ON. It will be necessary
to turn the power OFF and then ON again to enable a new setting if the pa-
rameter is accessed only when the power is turned ON.
Note
Refer to
4-1 PLC-setup
for details on the PLC Setup.
Communications
The Communications Switches determine whether the peripheral port and
Switches
RS-232C port connected through the communications port operate with the
standard communications settings or the communications settings in the PLC
Setup.
Inverter Interface
The PLC core communicates to the Inverter through IR-, DM-memory, either
by direct mapping or through the Transfer command.
Note
Refer to
section 5-4 Transfer command
for more details.
Содержание 3G3MV-P10CDT-E
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