Beijer Electronics Frequency Inverter BFI-E3 KI00369B 2019-09
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5.14 Modbus RTU
A Modbus RTU network with BFI-E3, BFI-H3 or BFI-P2 is connected as below:
BFI-E3 IP66 has two RJ45 female built-in and by that does not need OPT-2-J45SP-BFI.
Settings in BFI-E3 are speed setting is 115 200 bit/sec, 8 data bits, 1 stop bit, No Parity.
Hardware Function Comment
CAB 114 Shielded cable with one RJ45 and 3 wires
marked SDA, SDB and SG for screwterminals.
Cable length 3 m. Modbus RTU- pin7 and
Modbus RTU+ pin8 in BFI.
CAB 113 Shielded cable with one RJ45 for BFI and one 9-
pole D-sub for X2 panels.
Cable legth 3 m. Built-in 120 ohm resistor in D-sub
between pin7 and pin8.
OPT-2-J45SP-BFI T-Connection of 2 serial cables into one drive. RJ45 male to BFI and 2 female RJ45 for network
connection
OPT-2-RJTRM-BFI
RJ45 with a 110 ohm resistor. To be put in the last BFI-splitter.
Para-
Name Default
Recommended
Function
P-12
Command Source 0 3
3= Control by Modbus RTU and ramptime in P-03 and P-04.
4= Control by Modbus RTU and ramptime sendt by Modbus.
P-14
Parameter Access 0 201 201 = Parameters above P-14 accessable.
P-24 Fast Deceleration time
0 Fast Deceleration ramptime from 0 to 50 Hz.
P-36
Communication
Setting (Power off/on
when parameter has
1
Modbus
115,2k
3000
115,2k
3 settings in one parameter.
- Stationnumber 0-63. First Drive should be stationnumber 1.
- Communication speed, 115,2=115.200 bits/sec.
- Communication timeout. 0 = No timeout [msec].
2
1
DI1: Startsignal
+24 VDC
DI1 must always be closed to start
BFI
CAB 113
Patchcable
Cat 6
Modbus master
X2 panel
CAB 114
RS485 + Pin1
OPT-2-
RJTRM-
OPT-2-
RS485 – Pin6
Modbus master
Nexto Express
D+
D-
GND
BFI
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