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ANALOG IN 15 BIT VOLTAGE/CURRENT 8CH IC220ALG221
Special Methods
The group commands are regarded as special methods.
Task:
–
The measured values of channels 1 to 4 (group A) are to be read in one cycle and the measured
values of channels 5 to 8 (group B) in another cycle (7000
–
The input channels are to be operated in different configurations (e.g., as in example 2).
Procedure:
1
Install the terminal.
2
Connect the voltage (power up).
3
Configure each individual channel in the terminal in turn
(initialization phase; e.g., in the initialization phase of the application program).
As the channels are to have different configurations, they must be configured using the 4x00
command.
4
Use group command 7000
Then use group command 7100
Both groups can be reread cyclically.
Advantages of the Standard Methods Compared With the Special Methods
–
The standard methods read the measured values with greater reliability because the command
is mirrored for every measured value. Thus, it is possible to detect precisely which channel
supplied the measured value.
–
The standard methods enable more accurate error diagnostics than the special methods.
–
If you switch the group command for reading the channels (e.g., between 7000
when reading two groups of four channels each), you must allow sufficient time to do so. It must
be ensured that the received measured values belong to the requested group. This can only be
ensured using waiting times.
36
to read the measured values for channels 1 to 4 simultaneously.
hex
to read the measured values for channels 5 to 8.
hex
for group A; 7100
hex
for group B).
hex
hex
and 7100
hex
hex
6226B_GE
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