C o m m u n i c a t i o n s
2
1 Scope of communications
Communication line enhances usability of the controller from autonomous controller to the
one which performs the tasks in a system. Basic feasibilities are described in the 5 following
articles:
•
Reading data from the controller,
Prot
=
Mod
. Enables to acquire data (SP values,
process values, ..) for PC, their visual data processing and storing. The form for showing
and presenting depends on the features of the visual program used.
•
Configuration of controller,
Prot
=
Mod
. In graphic environment of PC you can
easily configure and set parameters that are transferred to PC by one command. The
configuration via PC can be used for example for more sophisticated setting of controllers
or for setting of production line by the technology procedures stored in PC.
•
The controllers configured in system Master – Slave
,
Prot
=
SGnL
. The controller
MT825A - MASTER retransmits set point value and the SLAVE - controllers (MT600)
receive this value and process it. In comparison with analog retransmit the MASTER-
SLAVE system has the advantage in galvanic isolation of controllers and the precision of
transferring of STP value in 1 decimal point.
•
Cascade controlling
,
Prot
=
SGnL
. Used in process with long lag times between the
energy source and process measured value.
•
Printing protocols of measurement,
Prot
=
Prnt
. Time, process and set point values
are shown on a printed copy, the format is illustrated below.
************************
DATE: 20.08.1999
************************
time: sp: c:
15:47 852 850
15:57 860 859
16:07 868 868
16:17 876 877
16:27 884 884
16:37 892 892
16:47 900 901
16:57 900 900
17:07 oFF 889
17:17 oFF 852
