42
Compoway-F communication
Section 3-3
3-3-3
Free communication blocks
With free communication blocks it is possible to read data, write data and
send an operation instruction directly to a Temperature Controller, without any
interference by the Gateway. With free communication blocks, however, the
PROFIBUS Master system has to assemble the commands.
The Free Communications blocks can be selected as I/O modules from the
GSD file. Three free communication blocks are defined and can be used to
configure the PROFIBUS-DP Gateway Unit.
1.
Read for reading one element of the parameter defined in the TC
2.
Write for writing one element of parameter defined in the TC
3.
Operation for executing any operation defined in TC.
In the next table an overview is presented on how the free communication
blocks are composed for several different device types.
A free communication block always contains a device address (one word with
a value in the range between 0000 (hex) and 0063(hex)) and a mini FINS
command. The length of the mini FINS command depends on the command
type (operation, write or read) to be executed.
Operation mini FINS
command
This command type consists of a command code MRC/SRC, followed by an
instruction code, the value of this instruction code is command type depen-
dent. The operation of a mini FINS command is defined as follows.
The response of this command for a correct executing of the command is
defined as:
Refer to the operation manual of the required Temperature Controller for
more commands and detailed information.
Example
Stopping channel 1 of the E5_R uses the command 000530050101(hex);
command code is 3005(hex), followed by the instruction code 0101(hex). The
device address used in this example is 0005(hex).
Assuming there is no error, the response is four bytes: 30050000(hex).
Read mini FINS command
This command type consists of 5 settings represented as follows:
Compoway-F
Device
type
Module name
Output words
Input words
Total
output
words
Total
input
words
Number
of
channels
E5_N,
E5ZN,
E5_R
Free comms Read 4
WI / 5 WO
Device address (1 word)
Command data (4 words)
Response code (2 words)
Read data (2 words)
5
4
N/A
Free comms Write 2
WI / 7 WO
Device address (1 word)
Command data (4 words)
Write data (2 words)
Response code (2 words)
7
2
N/A
Free comms Opera-
tion 2 WI / 3 WO
Device address (1 word)
Command data (2 words)
Response code (2 words)
3
2
N/A
Device address
Command code
MRC/SRC
Instruction code &
related information
2 bytes
2 bytes
2 bytes
Command code
MRC/SRC
Response
code
2 bytes
2 bytes
