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4-3 Data Transmission and Reception
This section provides outlines of data transfer between a ladder program and
the MC Unit.
4-3-1 Types of Data
Four types of data can be transferred.
• Position data
• System parameters
• Monitoring data (for the current position and number of the program being
executed)
• Special data (regarding the flash memory)
Position data can be read and written. Monitoring data and part of system
parameters can be read only.
The above types of data are allocated to the following addresses of the MC Unit.
Address Data
0000 to 1999 Position data
The addresses correspond to A0000 to A1999.
4000 to 5999 System parameters
6000 to 6099 Monitoring data
6100 to 6101 Special data
The above addresses must be allocated to enable a ladder program to transfer
data with the MC Unit.
4-3-2 Types of Data Transmission and Reception
The following two types of data transmission and reception are available to a lad-
der program.
I/O Transfer I/O transfer makes it possible to transfer data of 6,000 word max. by using the
PC’s I/O refresh data, initial setting, and expansion data areas of the interface
area.
Use I/O transfer to transmit or receive a large volume of position data.
Intelligent Transfer The IOWR and IORD instructions of a ladder program make it possible to trans-
fer a maximum of 128-word data.
The MC Unit can use these instructions if the MC Unit is mounted to the
C200HX, C200HG, or C200HE.
Intelligent transfer can transmit or receive data faster than I/O transfer.
Use intelligent transfer to transmit or receive a small volume of position data at
high speed.
Data Transmission and Reception
Section 4-3
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