5.11
Relay outputs (K1)
An external fault indicator is available over the potential-free contacts of the built-in relay (max. contact
rating
Technical data and connection diagram).
For operation the relay is energized, terminals
“
11
”
and
“
14
”
are bridged. For fault the relay is de-
energized, terminals
“
11
”
and
“
12
”
are bridged (
Diagnostics / faults).
•
Fault indicated for: line fault, blown internal semiconductor fuse, broken controller-internal voltage
supply, motor over temperature (thermostats
“
TB
”
, thermistors
“
TP
”
connected).
•
By sensor failure (only in P-Control operation
2.01
..
3.02
) message only via
fl
ash code of signal
lamp (code
|
3
|
), the relay remains energized.
•
When switching off via enable (D1 = Digital In 1), the relay remains energized.
5.12
Communication
5.12.1
Networking via MODBUS-RTU
The device comes equipped with a RS-485 interface for networking via MODBUS. Conntection at:
“
A
(D+)
”
,
“
B (D-)
”
and
“
GND
”
.
Addressing is performed by an external terminal or a PC with the appropriate software.
Alternatively the USB interface can be used for networking over MODBUS.
A maximum of 64 participants can be directly connected to one another, and another 64 participants
via a repeater.
5.12.2
RS-485 - network design and interface parameter
Please ensure the correct connection; i.e. "A (D+)" must always be connected to "A (D+)" of the next
devices. The same applies to "B (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).
general example for MODBUS device connection
The data line must be connected 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.
MODBUS
26.02.2007
v_modbus_verbindung.vsd
Example for MODBUS connection
Recommended wire types
1. CAT5 / CAT7 cables
2. J-Y (St) 2x2x0.6 (telephone cable)
3. AWG22 (2x2 twisted pair)
When using telephone cable with four cable cores, we recommend the following allocation:
“
A (D+)
”
= red,
“
B (D-)
”
= black,
“
GND
”
= white
Operating Instructions
Dcontrol
–
model series PKDM6..80
Electrical installation
L-BAL-E143-GB 1914 Index 009
Part.-No.
17/40
