PCL
Pleiger Elektronik GmbH & Co. KG
www.pleigerelektronik.de
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Pleiger Control Loop
Manual version 2018-03
9.3 Busmaster and local operation panel
For local operation and parameter set-up every master pair must be connected to a PLD. Masters and
PLD are connected via Ethernet and communicating with Modbus-TCP protocol.
Up to 8 PLD
’s can connect to one busmaster for “local operation” and max. 8 busmaster are operable
by 1 PLD.
9.4 Modbus RTU Interface
The RS 485 port of the dc power supply module is intended to connect a supervisory control system
via Modbus RTU. The acts as a RTU slave whereas the SCADA system is the master. The baudrate
is selectable but should not be lower than 38400 baud. The explanation of the complete data model is
provided in a separate document (PCL Modbus data model V3.0).
Master
1
A
/ IP 192.168.110.1
01
A
C
E
G
I
K
M
O
B
D
F
H
J
L
N
P
Ethernet
Switch
Ethernet
Master
1 B
/ IP 192.168.110.1
02
PLD
1
/ IP 192.168.110.12
1
PLD
2
/ IP 192.168.110.12
2
8 PCL loops A…P
SCADA
Modbus-
RTU
Figure 9-3: Busmaster-Cabinet-Configuration for example with one Busmaster-pair
and 2 PLDs