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Lodam Condensing Unit Controller

Modbus Interface

Version

2

.0

LMC341 DIWE

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Summary of Contents for Lodam LMC341 DIWE

Page 1: ...Lodam Condensing Unit Controller Modbus Interface Version 2 0 LMC341 DIWE ...

Page 2: ...able specification 7 5 3 Configuration 7 5 4 RS485 Repeater 7 5 5 Recommended guidelines for cable routing 8 6 Setup 8 6 1 Modbus configuration 8 6 2 Data values scaling and data types 9 6 3 Modbus function codes 9 6 4 Modbus exception codes 9 7 Functions 10 7 1 Status information 10 7 2 Inputs 11 7 3 Outputs 12 7 4 Alarms 13 7 5 Control 15 7 6 Modbus sample communication 16 8 Standards 16 9 Troub...

Page 3: ...Modbus Interface manual LMC341 DIWE Page 3 ...

Page 4: ...isposal of electrical and elec tronic waste the penalties are specified by local waste disposal legislation 1 1 Installation Before installation the user should be thoroughly familiarized with this technical manual especially with purposes installation settings and operation Special care should be taken when installing and con necting external equipment sensor high voltage etc and handling the PCB...

Page 5: ...by optimizing your system to save energy time and money Remote control of the controller is via Modbus over a RS485 connection and this document describes the settings for this 3 Definitions BEST BEST software HW Hardware electronics LMT Lodam Multi Tool PC communication tool for Lodam controllers Modbus Application layer messaging protocol http www modbus org specs php RS485 Hardware communicatio...

Page 6: ...interval of seconds will be sufficient for the monitoring purpose 4 How to 4 1 Connection samples The Modbus communication is connected using a shielded 2 wired twisted pair cable RS485 The two signal wires must be in the same pair of wires The connection can be multi drop with up to 10 LMC341 DIWE controllers on the same communication line For larger installations or from building to building a R...

Page 7: ...llers Max 200 m cable length Characteristic impedance between 100 Ohm and 130 Ohm Foil or braided shield shield grounded at the master controller Shunt capacitance 100 pF m AWG24 2 120 Ohm termination Receiver impedance 12 kOhm 5 3 Configuration There can be up to 10 LMC341 DIWE controllers on the same Modbus string If other equipment than LMC341 DIWE controllers are con nected on the same string ...

Page 8: ...ation cables should be twisted pair for the data wires 6 Setup Communication with the LMC341 DIWE is via Modbus RTU Configuration and reading of settings and readings from the LMC341 DIWE is described in the following sections Client Server Initiate request Perform the action Initiate the response Receive the response Function code Data Request Function code Data Response 6 1 Modbus configuration ...

Page 9: ...0 To transmit a value it must be multiplied by 100 i e 1 23 123 A received value must be divided by 100 i e 123 1 23 uint8 Unsigned 8 bit integer uint16 Unsigned 16 bit integer sint16 Signed 16 bit integer uint32 Unsigned 32 bit integer sint32 Signed 32 bit integer 6 3 Modbus function codes Function Code hexadecimal Code decimal Read Holding Registers 03 03 Read Input Register 04 04 Read Write Mul...

Page 10: ... Enabled Input register 1539 HeatRecover Unit None Scale 1 unit8 0 Heat recovery is enabled Animation HeatRecover 0 Off 1 Enabled Input register 1540 SetPointSrc Unit None Scale 1 unit8 0 What setpoint is used right now Animation SetPointSrc 0 User setpoint 1 2nd Setpoint 2 Week program Input register 1541 StatusIcon Unit None Scale 1 unit8 0 Unit status as on the displays main menu Animation Stat...

Page 11: ...ster 1553 TC Unit C Scale 100 sint16 Saturated discharge condenser temperature Input TC 10000 C 12000 C Input register 1554 Tdis Unit C Scale 100 sint16 Discharge temperature Input Tdis 10000 C 12000 C Input register 1555 Tamb Unit C Scale 100 sint16 Ambient temperature Input Tamb 10000 C 12000 C Input register 1556 Tsuc Unit C Scale 100 sint16 Suction temperature Input Tsuc 10000 C 12000 C Input ...

Page 12: ... 1 Active Input register 1572 SC_Cpr1 Unit Boolean Scale 1 uint8 Security chain for compressor 1 Only valid in dual compressor mode Input SC_Cpr1 0 Ok 1 Failure Input register 1573 SC_Cpr2 Unit Boolean Scale 1 uint8 Security chain for compressor 2 Only valid in dual compressor mode Input SC_Cpr2 0 Ok 1 Failure Input register 1574 Name Possible Values Default Description Register type Address RE1 U...

Page 13: ...type Address RE7 Unit Boolean Scale 1 uint8 Fan 1 Output RE7 0 Off 1 On Input register 1590 RE8 Unit Boolean Scale 1 uint8 Fan 2 Output RE8 0 Off 1 On Input register 1591 RE9 Unit Boolean Scale 1 uint8 Compressor running for ΔpII Output RE9 0 Off 1 On Input register 1592 Name Possible Values Default Description Register type Address Count Unit None Scale 1 uint16 0 Number of alarms in the list act...

Page 14: ...ode8 Unit None Scale 1 uint16 0 Alarm number of less severe alarm Alarm Code8 0 No alarm 100 999 Alarm number Input register 1611 Code9 Unit None Scale 1 uint16 0 Alarm number of less severe alarm Alarm Code9 0 No alarm 100 999 Alarm number Input register 1612 Code10 Unit None Scale 1 uint16 0 Alarm number of less severe alarm Alarm Code10 0 No alarm 100 999 Alarm number Input register 1613 Code11...

Page 15: ...l mode Condens Economy 0 Eco 1 LowSound Holding register 1637 Ambient Comp Unit Boolean Scale 1 uint8 1 Use ambient compensation or fixed condenser setpoint Condens AmbComp 0 Off 1 On Holding register 1638 Setpoint Unit C Scale 100 sint16 Capacity controller setpoint Range depends on compressor and refrigerant Capacity Tset 4500 C 3500 C Holding register 1639 2nd Setpoint Unit C Scale 100 sint16 S...

Page 16: ...mercial and lightindustrial environments CE approved Request Input register 0x0b Slave address 1 byte 0x04 Function code 1 byte 0x1000 Start addr 2 bytes 0x000e Quantity 2 bytes 0x75a4 CRC 2 bytes Response 0x0b Address 1 byte 0x04 Function code 1 byte 0x1c NB bytes of data 1 byte 0xffff Value1 2 bytes 0x0000 Value2 2 bytes 0x0950 Value3 2 bytes 0x08b0 Value4 2 bytes 0xe4a8 Value5 2 bytes 0x0014 Va...

Page 17: ...12 24 VAC Check if Data and Data wires have been switched Check if the communication node adress setting matches the selected Note Node address should be between 1 and 247 both included Check if the communication speed matches the selected Check if communication is running The LUP200 display will show readings and commands ...

Page 18: ...nitions 5 Disposing 4 F Functions 10 G General 5 I Inputs 11 Installation 4 Internally connected 7 M Master controller 6 Modbus configuration 8 Modbus exception codes 9 Modbus function codes 9 Modbus sample communication 16 O Outputs 12 S Safety 4 Setup 8 Standards 16 Status information 10 ...

Page 19: ...Modbus Interface manual LMC341 DIWE Page 19 11 Notes ...

Page 20: ...oundaries to bring you the most innovative and forward thinking solutions As part of the BITZER Group we are backed by one of the world s leading players in the refrigeration and air conditioning industry This alliance provides us with extensive network and application knowhow and allows us to stay at the forefront of climate control innovation And to help ensure comfortable surroundings for human...

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