Modbus Errorcode 6 with Beckhoff BK9050

[schneider_mav (Schneider)]

Hi OpenHAB Forum.

i have installed OpenHAB2 today and trayed something with my Beckhoff BK9050.
with this config i can read all the bit`s from my 3 Controller:

tcp.BK9050_H1.connection=192.168.5.6:502:60:0:0:3
tcp.BK9050_H1.type=holding
tcp.BK9050_H1.id=1
tcp.BK9050_H1.start=2056
tcp.BK9050_H1.length=4
tcp.BK9050_H1.valuetype=bit

tcp.BK9050_H2.connection=192.168.5.5:502:60:0:0:3
tcp.BK9050_H2.type=holding
tcp.BK9050_H2.id=1
tcp.BK9050_H2.start=2048
tcp.BK9050_H2.length=4
tcp.BK9050_H2.valuetype=bit

tcp.BK9050_G1.connection=192.168.5.7:502:60:0:0:3
tcp.BK9050_G1.type=holding
tcp.BK9050_G1.id=1
tcp.BK9050_G1.start=2056
tcp.BK9050_G1.length=1
tcp.BK9050_G1.valuetype=bit

My problem is i can’t write anything to the BK9050

016-12-26 00:04:01.755 [ERROR] [.binding.modbus.internal.ModbusSlave] - ModbusSlave (BK9050_H1): error when executing write request (net.wimpi.modbus.msg.WriteSingleRegisterRequest@4b429c): Error Code = 6
2016-12-26 00:04:02.434 [ERROR] [.binding.modbus.internal.ModbusSlave] - ModbusSlave (BK9050_H1): error when executing write request (net.wimpi.modbus.msg.WriteSingleRegisterRequest@1f41fd8): Error Code = 6
2016-12-26 00:04:03.000 [ERROR] [.binding.modbus.internal.ModbusSlave] - ModbusSlave (BK9050_H1): error when executing write request (net.wimpi.modbus.msg.WriteSingleRegisterRequest@c951d3): Error Code = 6
2016-12-26 00:04:03.585 [ERROR] [.binding.modbus.internal.ModbusSlave] - ModbusSlave (BK9050_H1): error when executing write request (net.wimpi.modbus.msg.WriteSingleRegisterRequest@1370972): Error Code = 6
2016-12-26 00:04:03.994 [ERROR] [.binding.modbus.internal.ModbusSlave] - ModbusSlave (BK9050_H1): error when executing write request (net.wimpi.modbus.msg.WriteSingleRegisterRequest@4b31e7): Error Code = 6

i think the items and the mapping are ok, because i trayed a third Party modbos tool and set some bits and i can read the correct state

Switch	mb_licht_OG_Office				"Büro"					<light>		(rOG_Office)			{modbus="BK9050_H1:47"}

[rossko57]

That’s right. Even though the Modbus binding provides a convenience feature to read bits from holding register tyres, there is no means to write individual bits.

Does the Beckhoff unit provide access as coil types?

Or see

Help me Binding Modbus 1.9.0 holding

Look at it this way; Modbus RTU FC16 only allows you to write whole 16-bit registers. That’s the way Modbus is, the binding cannot change that. Modbus FC22 would allow you to set individual bits in a register, but it seems like Duemmegi did not implement that command in the DFTS module, so it doesn’t help you here. So, any kind of host system wanting to update bits in a DFTS register has to do its own workaround somehow of re-writing a whole 16-bits to set the one(s) it wants. This workaroun…

[schneider_mav (Schneider)]

Hi rossko57,
after changing the config to coil, the start Position and the length it looks greate.

thx!

tcp.BK9050_H1.connection=192.168.5.6:502:60:0:0:3
tcp.BK9050_H1.type=coil
tcp.BK9050_H1.id=1
tcp.BK9050_H1.start=0
tcp.BK9050_H1.length=64
tcp.BK9050_H1.valuetype=bit

tcp.BK9050_H2.connection=192.168.5.5:502:60:0:0:3
tcp.BK9050_H2.type=coil
tcp.BK9050_H2.id=1
tcp.BK9050_H2.start=0
tcp.BK9050_H2.length=64
tcp.BK9050_H2.valuetype=bit

tcp.BK9050_G1.connection=192.168.5.7:502:60:0:0:3
tcp.BK9050_G1.type=coil
tcp.BK9050_G1.id=1
tcp.BK9050_G1.start=0
tcp.BK9050_G1.length=64
tcp.BK9050_G1.valuetype=bit