Basic Communication Area - Panasonic GT Series Operation Manual

4.2 Basic Communication Area

4.2.1 What Is the Basic Communication Area?
Communication is constantly being carried out between the GT and the PLC as shown below.
The GT accesses PLC-side devices for two purposes.
 Basic communication area
This area is for system control, such as screen switching settings. PLC devices are occupied
on a fixed basis, and communication is constantly being carried out.
Word devices (such as DT)
Three consecutive words
• Word device For reading and writing devices handled in word units (three consecutive words)
• Bit device For reading and writing devices handled in bit units (three consecutive words)
 References and output devices for parts
 These are devices that are used in part functions and can be freely specified by the user.
Communication is carried out on an ongoing basis only with those devices that are used on
the screen currently in use.
 With the GT, before devices are specified for part functions by way of screen creation
through GTWIN, the "basic communication area" must be determined.
 DT0 to DT2 and WR0 to WR2 are set as the default values for the basic communication
area, but the initial address can be changed from the GT Configuration screen in GTWIN.

Use the basic communication area in the PLC ladder program to control the
GT.
4.2 Basic Communication Area
Basic communication area
For part functions
(free device specification)
PLC internal devices
Bit devices (such as WR)
Three consecutive words
PLC
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