M
M
F
F
W
W
-
-
Z
Z
D
D
-
-
B
B
A
A
-
-
U
U
K
K
-
-
0
0
0
0
6
6
P
P
a
a
g
g
e
e
5
5
o
o
f
f
2
2
4
4
A system from the MFW product family
2.4 Correct and proper usage
The telecontrol system is intended exclusively for the applications described in these operating
instructions.
Any other usage can be hazardous and is forbidden. The manufacturer cannot be held liable for
the consequences of improper use of the MFW modules or for any application that does not
accord with the contents of these operating instructions.
3 Functional description
3.1 The MFW telecontrol family
The MFW telecontrol family features a flexible modular concept which can use practically all the media
available for data transmission purposes, such as GSM networks, landline dial-up lines, dedicated lines,
two-wire control lines, various radio data transmission ranges, optical fibres or LAN and WLAN. A
product of this extensive family is the two wire MFW telecontrol system. It is designed specially for the
integration of widely spread outdoor installations. The MFW can be operated as a fully independent,
cost-effective telecontrol system or as an extension to existing telecontrol interface modules.
In its minimum configuration, the telecontrol system consists of a central station and a substation. In
each station at least one basic module is needed. This includes the following function groups, display
and setting elements:
•
internal 2 wire modem
•
optionally 8 digital inputs or outputs with status LED, or an additional serial interface for protocol
coupling
•
SDP-interface for parameterisation, diagnostics and protocol coupling
•
one or two CAN bus interfaces for connecting the expansion modules
•
Operating status indicator and fault signalling contact
Each basic module can be fitted with up to a maximum of 15 expansion modules in order to increase
the I/O scope. These are connected via the CAN bus interface. Further information about the expansion
modules can be found in the respective instruction manual.
Each I/O module is given a
module number
. The data is exchanged between modules with the same
module number. The physical arrangement of the modules within the system (the station address) is of
no significance at all here. The input module with number 5, for instance, transmits its data to all the
output modules whose number is 5.
The
data exchange
is controlled by the master. All substations are cyclically synchronised with the
master in the query principle. This concerns not only the current input and output values but also the
error information and configuration data. This means that the master is always informed about the
current module occupancy of each substation and transmits the values of one input module’s without
additional parameterisation to all substations, that have an associated output module.
Measuring and set values, messages, commands and pulses
are transmitted. With digital I/O
modules, the inputs/outputs DE1- DE4 are switchable between static binary of pulse values. Analog
signals can be transmitted both as 0-10V voltage values or as 0-20mA current values. The recording of
the operating hours is possible with EM-G8DEX-0-B.-0 digital expansion modules.
