This python code allows to read and write the most common Beckhoff bus terminals ("Busklemmen") using the bus coupler BK9050 ("Busskoppler BK9050") over Ethernet TCP/IP.
It depends on the package pyModbusTCP. This can be installed with:
pip install pyModbusTCP
It is easy to use as the following example code shows:
from pyhoff import *
#connect to the BK9050 by tcp/ip on default port 502
bus_coupler = ModBusBK9050("172.16.17.1")
#list of all bus terminals connected to the bus coupler
#in the order of the physical arrangement
terminal_list = [KL2404, KL2424, KL9100, KL1104, KL3202,
KL4002, KL9188, KL3054, KL3214, KL4004,
KL9010]
terminals = bus_coupler.add_bus_terminals(terminal_list)
#Set 1. output of the first bus terminal (KL2404) to hi
terminals[0].write_coil(0, True)
#read the temperature from the 2. channel of the 5. bus
#terminal (KL3202)
t = terminals[4].read_temperature(1)
print(f"t = {t:.1f} °C")
#Set 1. output of the 6. bus terminal (KL4002) to 4.2 V
terminals[5].set_voltage(0, 4.2)The following terminals are implemented:
- KL1104: 4x digital input 24 V
- KL2404: 4x digital output with 500 mA
- KL2424: 4x digital output with 2000 mA
- KL3054: 4x analog input 4...20 mA 12 Bit single-ended
- KL3202: 2x analog input PT100 16 Bit 3-wire
- KL3214: 4x analog input PT100 16 Bit 3-wire
- KL4002: 2x analog output 0...10 V 12 Bit differentiell
- KL4004: 4x analog output 0...10 V 12 Bit differentiell
- Dummy terminals without io functionality: KL9100, KL9183, KL9188
Other analog and digital io-terminals are easy to complement. Pull requests are welcome.