TFTP Protocol
8--1
1070 072 196-101 (00.06) GB
8 TFTP Protocol
In addition to the BUEP-E communication protocol, the TFTP protocol
(Trivial File Transfer Protocol) is realized on the module, specification ac-
cording to RFC 782 of 1992.
It provides a PC or a Unix computer with a simple possibility of communicat-
ing with the controller. The controller can read data fields of up to 510 bytes.
Bigger fields are not supported. Writing into the data fields is not allowed ei-
ther because of data security reasons.
The controller and the corresponding data fields are interpreted as a file sys-
tem and can be read out by the COM-E module under the corresponding file
name.
Addressing of Operands / File system
<T
ype
of
Controller>
<T
ype
of
Operand>
<Operand
Offset>
<Amount
of
Op-
erands>
Type of Controller:
D CL50 CL500 ZS0
D CL51 CL500 ZS1
D CL52 CL500 ZS2
D CL53 CL500 ZS3
D CL4 CL400
Type of Operand:
D I Input
D O Output
D MMarker
D D Data word
D DF Data field
D DM Data module
Operand Offset:
D From this decimal number on, the data is read in.
Amount of Operands:
D L Initial identifier of amount of operands
Decimal number with the data amount 0 to 510.
Special case:
D In case of data words, the data module must be specified after the type of
the controller.
Examples:
D CL4M6L20 CL400, starting at marker 6, 20 bytes
D CL51DF100L200 CL500/ZS1, starting at data field 100, 200 bytes
D CL4DM0D0L510 CL400, data module 0, starting at data word 0, 510
bytes
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