User`s manual

Databuffer
22
5.2 Data control block in the PLC system
The data control block consists of 4 registers:
The command register is set in the PLC system and can assume the follo-
wing values:
1
Write to memory bank
2
Read from memory bank
3
Fill the selected area with the value found in Dn3
The terminal replies in the same register in a similar way to the following:
0
Reading/writing completed
FFFF
Error when reading/writing
Register Description
Dn0 Command register.
Dn1 Start index in the memory bank to read from/write to.
Dn2 Number of registers to read/write.
Dn3 Start register in the PLC system to read from/write to. (e.g. if 100
is stated in this register, reading/writing will begin in register D100).