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Siemens SEZ50MB Basic Documentation

Rwd primary controls modbus interface
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SEZ50MB
RWD Primary Controls Modbus Interface
Basic Documentation
CB1P3099en_01
27.10.2009
Building Technologies

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  • Page 1 SEZ50MB RWD Primary Controls Modbus Interface Basic Documentation Building Technologies CB1P3099en_01 27.10.2009...
  • Page 2 Siemens Switzerland Ltd. Building Technologies Group International Headquarters Gubelstrasse 22 CH-6301 Zug Tel. +41 41-724 24 24 © 2009 Siemens Switzerland Ltd. Fax +41 41-724 35 22 www.siemens.com/sbt Subject to change 2 / 26 Siemens RWD Primary Controls Modbus Interface...

  • Page 3: Table Of Contents

    Before Starting....................4 Additional Documents..................4 Abbreviations & Terminologies ..............5 Important Notes ..................... 5 Product Overview ..................6 Commissioning SEZ50MB ................8 Modbus Operation ..................10 RWD Parameters & Addresses..............14 Appendix A:Standard IEEE-754 Format........... 23 6.1.1 General Description ..................23 6.1.2...

  • Page 4: About This Document

    RWD & SEZ50MB Accessory: ARG62.21 Wall or Panel Mounting Enclosure This document explains the general functions of the SEZ50MB and how to use it to monitor all control parameters and update some writable control parameters for RWD’s applications. Target Audience Product &...

  • Page 5: Abbreviations & Terminologies

    Commissioning Commissioning of this product and products connected with it must be undertaken by qualified staff that has been appropriately trained by Siemens Building Technologies. Wiring When wiring the system, the AC 230 V section must be strictly segregated from the...

  • Page 6: Product Overview

    Modbus RS485 Interface (+, -, Ref) RS232 Interface (DB9 Male Connector) The Amber LED Indicator Power Supply Connection & Communication (it will flash when data going in/out from SEZ50MB) Interface Descriptions AC 24 V SELV Power Supply Interface (2-Pin Terminal) G &...
  • Page 7 Note: The DB9 male socket of RS232 interface connected on the RWD device will have TXD at Pin 2 and RXD at Pin3; Pin 4 & 7 will be “Inputs”. The SEZ50MB device address can be set via a 8-way DIP switch and the valid Device Address Bit addresses are 1 to 247.

  • Page 8: Commissioning Sez50Mb

    • For the Modbus network, connect the 3-wire Modbus terminals (+, -, Ref) of the SEZ50MB device to either the RS232 COM port or USB port of a PC via a RS232- TO-RS485 or a USB-TO-RS485 converter (Please refer to “Modbus connection” of next page);...
  • Page 9 AC 24 V SELV AC 230 V Note: For each SEZ50MB device connected with RWDxx operated at AC 230V, it gets its AC 24 V from AC 230 V by a SELV electrically isolated transformer (e.g. Siemens SEM62.1 or SEM62.2). To ensure best performance, this isolated transformer should not power other devices.

  • Page 10: Modbus Operation

    Different Modbus all available function codes above and the returned messages from the RWD via Function Codes SEZ50MB. (To interpret the meanings of the returned messages, please refer to the next section RWD Parameters & Addresses). Function Code 0x01 à...
  • Page 11 Function Code 0x03 à Read RWD68 parameter (ADDR = 40117, 40118) called “SP3day” with Modbus ADDR = 0116, 0117: SEZ50MB Function Modbus Address Data Length CRC16 Check Device Code Address Send SEZ50MB Function Byte Status CRC16 Check Device Code Count...
  • Page 12 Exception Codes Whenever an unexpected message is received or an error is encountered by SEZ50MB, the SEZ50MB would return a RESPOND for such errors. Modbus communicaton frame contains an error field for exception codes, which can be used by network application to determine what appropriated action will be taken.
  • Page 13 Function Code 0x04 à Read RWD68 parameter (ADDR = 30055, 30056) called “RWDAPP” with Modbus (Error Message) ADDR = 0054, 0055: SEZ50MB Function Code Modbus Address Data Length CRC16 Check Device Address Send 00 or 01 85 ↑ WRONG INFO...

  • Page 14: Rwd Parameters & Addresses

    SEZ50MB. The longest process time of SEZ50MB would be around 6 seconds; • Some values may be rounded by SEZ50MB before passing to RWD in order to fulfill the current STEP SIZE and RESOLUTION. For example, if a setpoint is entered as 16.7, it will be presented as 16.7 or rounded to 16.5 –...
  • Page 15 0: Not selected 1: Selected 30001 X1_input IEEE754 X1 (Sensor) Input 30003 X2_input IEEE754 X2 (Sensor) Input 30005 X3_input IEEE754 X3 (Sensor) Input 15 / 26 Siemens RWD Primary Controls Modbus Interface CB1P3099en_01 Building Technologies RWD Parameters & Addresses 27.10.2009...
  • Page 16 1: Pt1000 2: 0 to 10 V 3: VR or Digital Input 30027 Compressor_Stage IEEE754 Compress Stage Selection Status: 1: Stage1 2: Stage2 16 / 26 Siemens RWD Primary Controls Modbus Interface CB1P3099en_01 Building Technologies RWD Parameters & Addresses 27.10.2009...
  • Page 17 0: Not in frost protect status 1: In frost protect status via B3 Bit 6: COST_OUT_RANGE 0: Still in range of 0 to 9999 17 / 26 Siemens RWD Primary Controls Modbus Interface CB1P3099en_01 Building Technologies RWD Parameters & Addresses...
  • Page 18 0: Close 1: Open 30063 WinSum_Mode IEEE754 Status of Winter/Summer Mode 0: Summer mode 1: Winter mode 40001 ALTSUM IEEE754 Summer ChangeOver Set Point 18 / 26 Siemens RWD Primary Controls Modbus Interface CB1P3099en_01 Building Technologies RWD Parameters & Addresses 27.10.2009...
  • Page 19 Set Point of Heating 3 for Night 40089 * SP_ind_C IEEE754 Set Point of Cooling for ind Y (Used in RWD45 application no = 70 to 99) 19 / 26 Siemens RWD Primary Controls Modbus Interface CB1P3099en_01 Building Technologies RWD Parameters & Addresses 27.10.2009...
  • Page 20 Offset for C3 40153 SD1_RWD68 IEEE754 SD1 for RWD68 in application no = 45 & 55 40155 * XDZ_H2 IEEE754 Offset for H2 20 / 26 Siemens RWD Primary Controls Modbus Interface CB1P3099en_01 Building Technologies RWD Parameters & Addresses 27.10.2009...
  • Page 21 86 to 266: 86 ℉ to 266 ℉ 40193 * T_Max2 IEEE754 The maximum temperature of tank 2 If the TempUnit = C, 0: OFF 21 / 26 Siemens RWD Primary Controls Modbus Interface CB1P3099en_01 Building Technologies RWD Parameters & Addresses 27.10.2009...
  • Page 22 RWD32/82 application no = 61 RWD68 application no = 71 40217 * XDZ_AppC IEEE754 Dead Zone for, RWD32/82 application no = 21 RWD68 application no = 31 22 / 26 Siemens RWD Primary Controls Modbus Interface CB1P3099en_01 Building Technologies RWD Parameters & Addresses 27.10.2009...

  • Page 23: Appendix A:standard Ieee-754 Format

    32 bits -126≤E≤127 1 → negative When reading the IEEE754 format, the SEZ50MB always use “Float Inverse” for the Note: correct display mode for all values. For example: If a value is 28.6, its 32 bits binary representation is: à...

  • Page 24: Appendix B: Generating A Crc16 Check Sum

    0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40 24 / 26 Siemens RWD Primary Controls Modbus Interface CB1P3099en_01 Building Technologies Appendix B: Generating A CRC16 Check Sum 27.10.2009...
  • Page 25 0x8D, 0x4D, 0x4C, 0x8C, 0x44, 0x84, 0x85, 0x45, 0x87, 0x47, 0x46, 0x86, 0x82, 0x42, 0x43, 0x83, 0x41, 0x81, 0x80, 0x40 25 / 26 Siemens RWD Primary Controls Modbus Interface CB1P3099en_01 Building Technologies Appendix B: Generating A CRC16 Check Sum 27.10.2009...

  • Page 26: Trouble Shooting Hints

    Because of the rounding mechanism, there may be some difference between actual written value and value shown on LCD, for example, 16.7 & 16.5. [Resolve] Values may be rounded by SEZ50MB before transmitting to RWD due to Step Size or Resolution settings. Siemens Switzerland Ltd.

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