KSB PumpDrive 2 Bedienungsanleitung
Field Bus Module
Modbus RTU Module
PumpDrive 2
PumpDrive 2 Eco
Supplementary Operating
Manual
Legal information/Copyright
Supplementary Operating Manual Modbus RTU Module
Original operating manual
All rights reserved. The contents provided herein must neither be distributed, copied, reproduced,
edited or processed for any other purpose, nor otherwise transmitted, published or made available to a
third party without the manufacturer's express written consent.
Subject to technical modification without prior notice.
© KSB SE & Co. KGaA, Frankenthal 18/09/2020
Contents
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Modbus RTU Module
Contents
1 Supplementary Operating Manual....................................................................................................... 4
1.1 General..............................................................................................................................................................4
1.2 Field bus module connections .........................................................................................................................4
1.3 Installing the field bus module........................................................................................................................4
1.4 Connecting the field bus module....................................................................................................................6
1.5 Modbus RTU module........................................................................................................................................6
1.6 Modbus RTU protocol ......................................................................................................................................9
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1 Supplementary Operating Manual
1.1 General
This supplementary operating manual accompanies the installation/operating
manual. All information contained in the installation/operating manual must be
observed.
Table1: Relevant operating manuals
Type series Reference number of the installation/ operating
manual
PumpDrive 2 4074.81
PumpDrive 2 Eco 4074.82
1.2 Field bus module connections
The field bus modules are plug-in modules.
BA
1
3 4 5
2
Fig.1: Field bus module
Table2: Field bus module
Item
Component Description
1 M12 connector A B-coded
2 M12 socket B B-coded
3 Amber LED signal lamp Internal bus communication OK (heartbeat detected)
4 Green LED signal lamp Communication on field bus side active/possible
5 Red LED signal lamp Modbus malfunction or communication fault
▪Can be retrofitted
▪Internal T-connector (bus looped through); uninterruptible even in the event of a
frequency inverter power failure
▪Connector for self-assembly
1.3 Installing the field bus module
The field bus module can be fitted in an available slot of the frequency inverter.
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Blind cover
11
Fig.2: Blind cover
1 Blind cover
1. Unscrew the cross recessed head screws in the blind cover.
2. Remove the blind cover.
Field bus module
Fig.3: Inserting the field
bus module
1. Carefully insert the field bus module into the open slot. The plug-in module is
guided on rails until it engages in the contact.
Fig.4: Securing the field bus
module
2. Secure the field bus module using the 4 cross recessed head screws. IP55
enclosure protection is not provided until the screws have been tightened.
CAUTION
Incorrect assembly
Impairment of protection provided by the enclosure (protection may be
compromised)!
▷Cover unused M12 connections with a cap (included in the scope of supply).
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1.4 Connecting the field bus module
Observe the following when connecting the field bus module:
▪Before the bus connection is established among the nodes, potential equalisation
must have been implemented and checked.
▪For high-frequency shielding, use shielded cables and assemble according to EMC
requirements.
▪A minimum distance of 0.3metres is recommended between such cables and
other electric conductors.
▪Do not use the bus cable to make any further connections in addition to the field
bus module (for example, 230V alert and 24V start).
▪A cable specified for the field bus module must be used as the connecting cable.
CAUTION
Incorrect installation
Damage to the field bus module!
▷Never supply power to the field bus module via the M12 connections.
BA BA
21
Fig.5: Connecting the field bus module
Table3: Connecting the field bus module
Item Device M12 connector
1 Frequency inverter 1 M12 connector A: Coming
M12 socket B: Going
2 Frequency inverter 2 M12 connector A: Coming
M12 socket B: Going
1.5 Modbus RTU module
The Modbus RTU module is equipped with an RS485 interface with the Modbus RTU
protocol in accordance with specification V1.1b. Configuration takes place via
frequency inverter parameters.
Communication protocol MODBUS (RTU)
Bus terminator External
Interface EIA-485 (RS485)
Transmission rate 19,200 bit/s (variable)
Device type Slave
Bus access Polling between master and slave
Parity ▪Even
▪Odd
▪No Parity
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A cable specified for Modbus modules that has the following properties must be used
as a connecting cable:
▪Flexible
▪Shielded
▪Twisted wires for the data line (D0-D1)
▪The wave impedance should be at least 100Ohm.
▪Third core or second core pair for the common ground
b)
a)
2
1
5
3
41
5
4
3
2
Fig.6: Pin assignment: a) Contact arrangement of M12 connector, b) Contact
arrangement of M12 socket
Table4: Pin assignment
Pin Core colour code Assignment of M12 connector/
M12 socket (B-coding)
Signal
Cable (CAN open) Cable (DIN 47100)
1 - - VP (+5V) +5V
2 Blue Brown D- RS-485 A / data -
3 Black Green GND GND
4 White White D+ RS-485 B / data +
5 Shielding Shielding Shielding Shielding
Thread - - Shielding Shielding
5
4
32
1
D +
GND
D -
Shielding
5
3
4 1
2
MN
Fig.7: User-configured cable
ⓂM12 connector ⓃM12 socket
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1 2 3 4 51 2 3 4 5
D +
D -
GND
NM
63
52
51
AB
1 2 3 4 5 1 2 3 4 5
A B
Shielding
Fig.8: Wiring diagram
Bus terminator The terminating resistors must conform to the following standard: Profibus standard
DPDIN19245, part3, section6.3.
1390
390
220
2
3
4
Fig.9: Bus terminating resistor M12
The field bus terminating resistor can be plugged directly into the M12 socket. Bus
polarisation does not take place if the field bus module is de-energised. If the bus
terminator is to be independent of the field bus module power supply, it must be
implemented externally using an active bus terminator.
NOTE
The frequency inverter is reset when a field bus module is replaced or retrofitted.
Menu 3-12 for setting the parameters of the field bus module is then enabled in the
control panel.
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1.6 Modbus RTU protocol
Table5: Address range of system (0000 - 00FF)
Modbus address
Parameter name
Menu number
Size
Data type
Unit
Group
Access
(r: read, w: write)
Bit
Description
0000 Modbus Status - DWORD 32-bit bit
field
- System Status r 0 System connection OK
1 Pump 1 online
2 Pump 2 online
3 Pump 3 online
4 Pump 4 online
5 Pump 5 online
6 Pump 6 online
0002 System Alerts - DWORD 32-bit bit
field
- System Status r 0 Lack of water
0004 Reserved - - - - System Status - - -
0006 System Warnings -
-
DWORD
-
32-bit bit
field
- System Status r 0 Setpoint monitoring
1 Actual value monitoring
2 Flow rate monitoring
3 Suction pressure monitoring
4 Discharge pressure monitoring
5 Differential pressure monitoring
6 Temperature monitoring
7 Low flow velocity
8 Overflow
0008
- 00FE
Reserved - - - - System Status - - -
0020 System Start / Stop 1-3-1 DWORD Boolean - System Control r, w - -
0022 Actual Value (Closed-loop
Control)
1-2-3-1 DWORD Float32 Base unit of the type of
control selected
System Control r, w - -
0024 Setpoint (Closed-loop
Control)
1-3-2 DWORD Float33 Base unit of the type of
control selected
System Control r, w - -
0026 Control Value (Open-loop
Control)
1-3-3 DWORD Float32 Speed System Control r, w - -
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Modbus address
Parameter name
Menu number
Size
Data type
Unit
Group
Access
(r: read, w: write)
Bit
Description
0028 Maximum Number of
Pumps Running
3-7-2 DWORD UINT32 - System Control r, w - -
002A Control Point 3-6-2 DWORD ENUM - System Control r, w 0 Local
1 Field bus
002C Actual Value Source 3-6-3 DWORD ENUM - System Control r, w 0 Local
1 Field bus
002E Actual Value (Closed-loop
Control) in Percent
1-2-3-1 DWORD Float32 Percent System Control r, w - -
0030 Setpoint (Closed-Loop
Control) in Percent
1-3-2 DWORD Float32 Percent System Control r, w - -
0032 Control Value (Open-loop
Control) in Percent
1-3-3 DWORD Float32 Percent System Control r, w - -
0034-
003E
Reserved - - - - System Control - - -
0040 Suction Pressure 1-2-3-2 DWORD Float32 Pressure base unit System Process Variable r - -
0042 Discharge Pressure 1-2-3-3 DWORD Float32 Pressure base unit System Process Variable r - -
0044 Differential Pressure 1-2-3-4 DWORD Float32 Pressure base unit System Process Variable r - -
0046 Flow Rate 1-2-3-5 DWORD Float32 Flow rate base unit System Process Variable r - -
0048 Level 1-2-3-6 DWORD Float32 Level base unit System Process Variable r - -
004A Temperature 1-2-3-7 DWORD Float32 Temperature base unit System Process Variable r - -
004C Flow Velocity of Fluid
Handled
1-2-3-8 DWORD Float32 Velocity System Process Variable r - -
004E Head 1-2-3-9 DWORD Float32 Height System Process Variable r - -
0050
-
005E
Reserved - - - - System Process Variable - - -
0060 Immediate Pump
Changeover
1-3-5 DWORD Boolean - System Function w - -
0062 Immediate Pipe Flushing 1-3-6 DWORD Boolean - System Function w - -
0064 Type of Control 3-6-1 DWORD ENUM - System Control w 0 OFF (open-loop control)
1 Discharge pressure
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