Lochinvar SYNC SB 1000 Instructions Manual
Modbus communication condensing boiler
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- Specification sheet (1 page) ,
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- Replacement parts list (4 pages)
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SYNC-MODB Rev A
MODBUS COMMUNICATION
INSTRUCTIONS
SYNC Models: 1.0 - 1.3 - 1.5
This manual must only be used by a
WARNING
qualified heating installer / service
technician. Read all instructions,
including
this
manual,
the
Installation and Operation Manual,
and the Service Manual, before
installing.
Perform steps in the
order given. Failure to comply could
result in severe personal injury,
death, or substantial property
damage.
Save this manual for future reference.
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Summary of Contents for Lochinvar SYNC SB 1000
- Page 1 SYNC-MODB Rev A MODBUS COMMUNICATION INSTRUCTIONS SYNC Models: 1.0 - 1.3 - 1.5 This manual must only be used by a WARNING qualified heating installer / service technician. Read all instructions, including this manual, Installation and Operation Manual, and the Service Manual, before installing.
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Page 2: Table Of Contents
Introduction The information contained in this manual provides general guidelines for the implementation of Modbus communication with the Lochinvar SYNC boiler. All Modbus networks are implemented utilizing a master-slave arrangement where all SYNC boilers are slaves and the master is a building automation system capable of communicating over a RS-485 serial connection. -
Page 3: Configuration
Modbus Instructions Configuration The Modbus communication board is equipped with a set of ten dip switches that are used to set the board configuration (address, baud rate, and parity settings). The first eight are used to set the address of each board. The ninth baud rate. The tenth is parity. -
Page 4: Timing Specifications
RTU has been chosen to be used with 0 = 9600 bps all Lochinvar Modbus communication. Please ensure that the Each message is started by at least 3.5 character times of master device is transmitting Modbus RTU. -
Page 5: Modbus Function Set
Modbus Instructions Configuration (continued) Modbus Function Set Function Sub Function Description Read Coil Status Read Input Status Read Holding Registers Read Input Registers Force Single Coil Preset Single Register Read Exception Status Diagnostic - Return Query Data Diagnostic - Restart Communication Diagnostic - Return Diagnostic Register Diagnostic - Force Listen Mode Diagnostic - Clear Counters and Diagnostic... -
Page 6: Modbus Exception Codes
Modbus Instructions Configuration Modbus Exception Codes MODBUS Exception Codes Code Name Meaning The function code received in the query is not an allowable action for the server (or slave). This may be because the function code is only applicable to newer ILLEGAL FUNCTION devices, and was not implemented in the unit selected. -
Page 7: Memory Map
Modbus Instructions Memory Map Primary Data Tables Table Data Type Read / Write Discrete Inputs Single Bit Read Only Coils Single Bit Read / Write Input Registers 16-Bit Word Read Only Holding Registers 16 Bit Word Read / Write SYNC Boiler Memory Map Coils Address Description... -
Page 8: Input Registers
Modbus Instructions Memory Map SYNC Boiler Memory Map Input Registers Address Description Default Unit Min. Max. Resolution 30001 Discrete Inputs 1 - 16 65535 30002 Discrete Inputs 17 - 32 65535 30003 Discrete Inputs 33 - 48 65535 30004 System / Cascade Setpoint Degrees Celsius 30006 Cascade Total Power... -
Page 9: Wiring Requirements
Modbus Instructions Wiring Requirements Note that when the System Supply Temperature and/or the Tank Temperature are provided by the BAS, they need to be refreshed every few seconds. This is required in order to prevent unwanted fluctuations in these temperatures. If these values are not provided every few seconds (timeout is programmable), the boiler will revert to its own internal control. - Page 10 Modbus Instructions Wiring Requirements Figure 4-2_Control Inputs SECONDARY SMART TOUCH LOW VOLTAGE CONTROL MODULE CONNECTION BOARD PRIMARY SMART TOUCH CONTROL MODULE SEQUENCER / BUILDING MANAGEMENT SYSTEM OUTDOOR SENSOR HW TANK SENSOR HEAT EXCHANGER 1 / HEAT EXCHANGER 2 INLET TEMPERATURE SENSOR SYSTEM SENSOR HEAT EXCHANGER 1 / FLOW SWITCH...
- Page 11 Modbus Instructions Wiring Requirements (continued) Figure 4-3_Control Outputs SECONDARY SMART TOUCH LOW VOLTAGE CONTROL MODULE CONNECTION BOARD PRIMARY SMART TOUCH CONTROL MODULE ALARM BELL RUN TIME CONTACTS HEAT EXCHANGER 1 / HEAT EXCHANGER 2 BOILER PUMP SEQUENCER / BUILDING SYSTEM PUMP MANAGEMENT SYSTEM TOUCH PANEL HW PUMP...
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Page 12: Typical Boiler System Wiring
Modbus Instructions Wiring Requirements Figure 4-4_Control Location CONTROLLER 2 CONTROLLER 1 MODBUS COMMUNICATION BOARD (MTR01) HEAT EXCHANGER 1 HEAT EXCHANGER 2 Typical Boiler System Wiring Physical Configuration: Cascade without Individual Monitoring Modbus RS485 Port on Gateway or Building System Modbus RS485 Communication Bus Cascade Daisy Chain Connection... - Page 13 Modbus Instructions Wiring Requirements (continued) Physical Configuration: Cascade with individual Monitoring Modbus RS485 Port on Gateway or Building System Modbus RS485 Communication Bus Cascade Daisy Chain Connection Physical Configuration: Direct Control Modbus RS485 Port on Gateway or Building System Modbus RS485 Communication Bus...
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Page 14: Unit Operation
Modbus communication be interrupted longer than the Modbus timer. The timer is reset every time a Modbus write command is received with updated temperatures or commands. It is the recommendation of Lochinvar that this timer be set to the shortest value possible. - Page 15 Modbus Instructions Unit Operation (continued) Demand Configuration 5 In this configuration the unit is controlled by providing an enable signal and a rate command through Modbus communications. The rate command will be 0 - 100% of modulation. All sensors and limiting devices should be hardwired to the terminal strip on the back of the unit excluding the thermostat enable and tank thermostat enable signal.
- Page 16 Modbus Instructions Unit Operation DHW with remote control: This installation may or may not have the hot water generator in close proximity to the boiler. Its sensors and thermostat values are only available through the Modbus communication bus. To ensure that the SYNC boiler can properly respond to a call for hot water generation the following holding registers must be set in addition to other commands: Holding Registers Definition...
- Page 17 Modbus Instructions Unit Operation (continued) Rate and Temperature Conversions: For Example: Send a setpoint of 110°F. Rate The formula to use for the interpolation is: When issuing a rate command the rate can be communicated as percent modulation or a desired setpoint, depending on the Rate Command = setting of the BMS Type in the BMS Setup Menu.
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Page 18: Troubleshooting
Modbus Instructions Troubleshooting Should you encounter problems communicating over Status Codes (Input Registers 30014 and 30023) Modbus, the following items should be checked in this order: 2 = Heat Demand blocked due to high absolute outlet Physical Layer temperature Communications Configuration and Port Settings 3 = Heat Demand blocked due to high absolute flue Modbus Error Codes temperature... - Page 19 Lockout Codes (Input Registers 30016 and 30025) Turn OFF the main manual gas shutoff to the appliance. 161 = EEPROM code Parameters not Re-Programmed by Lochinvar Unplug the three (3) wire harnesses on the MTR01 control 164 = EEPROM code No Reset Allowed (> 15 minutes) board (see FIG.
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Page 20: Diagrams
Modbus Instructions Diagrams Figure 7-1 Ladder Diagram_Part 1 BOX DEPICTS OPTIONAL ITEMS LOW VOLTAGE 120 VAC HIGH VOLTAGE CONTROL CONTROL MODULE 1 MODULE 2 LOUVER RELAY 1 X6-8 X5-7 X5-7 X5-7 LOUVER X5-4 X5-4 RELAY 2 FLAP AIR PRESSURE FLAP AIR PRESSURE VALVE SWITCH... - Page 21 Modbus Instructions Diagrams (continued) Figure 7-2 Ladder Diagram_Part 2 BOX DEPICTS OPTIONAL ITEMS LOW VOLTAGE 120 VAC JUNCTION BOX 120VAC NEUTRAL GROUND HIGH VOLTAGE TERMINAL STRIP TERMINAL STRIP JUNCTION BOX N / L2 120V SUPPLY "L" 120V SUPPLY "N" SYSTEM PUMP CONTACTS ON / OFF...
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Page 22: Wiring Diagram
Modbus Instructions Diagrams Figure 7-3 Wiring Diagram LOW VOLTAGE 120 VAC HIGH VOLTAGE CM 1 PC INTERFACE BOX DEPICTS OPTIONAL ITEMS JUNCTION LOUVER CONTROL CONTACTS MODULE 1 LOUVER RELAY PC INTERFACE BOARD X1-4 HEX 1 CONNECTION BOARD BOILER PUMP CM 2 PC X1-2 CN3-16 INTERFACE... - Page 23 Notes...
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Page 24: Revision Notes
Revision Notes: Revision A (ECO #C04560) initial release. SYNC-MODB Rev A 10/09...
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