HEIDENHAIN MANUALplus 620 Technical Manual page 1795

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9.11 Data Transfer by PLC

9.11.1 PLC modules

January 2012

With the following PLC modules you can control the data interfaces from the

Modules 9100 and 9101: Assign/release the data interfaces

Module 9102: Interrogate the status of the interface

Modules 9103 and 9104: Transmit and receive a string from the string

memory. The transmit and receive buffers for the PLC are 128 characters

long. Since every STRING ends with an END character, a STRING can only

be up to 127 characters long.

Modules 9105 and 9106: Transfer a block of binary values (bytes) from the

Module 9107: Read bytes from the receiving buffer without erasing the

Modules 9112 and 9113: Send or receive ASCII characters via the data

Strings and binary data are transmitted using ASCII characters. Example:

Transfer of a block of binary data

When transferring binary data starting from the address B126, the ASCII

characters <F> <A> <8> <1> etc. are transmitted in sequence from the word

memory through the interface. Each byte contains two ASCII characters. The

transmitting and receiving buffers each hold 63 bytes.

9.11 Data Transfer by PLC

ASCII character