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If the Modbus
®
interface is used for network a
“
Z-Modul-A
”
(Part.-No. 380054) is necessary to use an
external terminal at the same time.
5.12 Digital inputs (D1, D2)
Various functions can be allocated to the digital inputs
“
D1
”
and
“
D2
”
(
F
IO Setup: Functions summary
of the digital inputs). Activation via
oating contacts (a low voltage of ca. 24 V DC is connected).
Attention!
Never apply line voltage to the digital input!
It is not permissible to connect inputs of several devices to each other!
5.13 Relay outputs (K1, K2)
Various functions can be allocated to the relay outputs
“
K1
”
and
“
K2
”
(
F
IO Setup: function and
inverting relais outputs). Max. contact rating
F
technical data and connection diagram.
Connection of the
oating contacts of relay
“
K1
”
to the terminals 11, 14, 12. Connection of the
oating
contacts of relay
“
K2
”
to the terminals 21, 24, 22.
5.14Communication
5.14.1
Networking via MODBUS-RTU
The device comes equipped with a RS-485 interface for networking via a MODBUS. Connection to
terminals
“
D+
”
,
“
D-
”
, and
“
GND
”
.
A maximum of 64members can be directly connected to one another, and another 63 members
via a repeater.
The address must be set in the
“
IO Setup
”
menu.
5.14.2
RS-485 - network design and interface parameter
You must ensure correct connection; i.e. "D+" must also be connected on the following devices to
"D+". The same applies to "D-".
In addition, a "GND" connection must be established, as dissimilar potential (over 10 V!) will lead to
the destruction of the RS-485 interface (e.g. lightning).
GN
D
D+
D-
GN
D
D+
D-
16.04.2008
v_modbus_geraete_anschluss.vsd
general example for Modbus device connection
The data line must be conducted from one device to the next. No other type of wiring is allowed.
Always use only two wires of one lead (twisted pair) for the connection.
Examples for Modbus connection
Recommended wire types
1. CAT5 / CAT7 cables
2. J-Y (St) 2x2x0.6 (telephone wire)
3. AWG22 (2x2 twisted pair)
When using telephone
ex with four cable cores, we recommend the following allocation:
“
D+
”
= red,
“
D-
”
= black,
“
GND
”
= white
Operating Instruction
Econtrol
–
model series EXDM
Electrical installation
L-BAL-E008-GB 0945 Index 005
Part.-No. 00156742-GB
15/85