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Supported device types and versions

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The protocol executes implements client (master) communication with arbitrary devices which supports a standard MODBUS RTU and ASCII in the versions of or MODBUS ASCII standards (serial communication) as well as MODBUS over TCP/IP. Moreover, it supports two extensions:

• Byte mode - allows working with devices that get back implement the values of registers as 1-byte variables (in contrast with Modbus standard in which the register value is 2 bytes).
• Variable mode - allows working with devices that get back values of that implement the registers with different sizes than standard 2 bytes. It was implemented because of support the flowmeter FloBoss 103 made by Fisher Controls International (at this time a part of Emerson Process Management): 1-byte variables, 4-byte unsigned/signed integers, text strings of length 10,12,20,40 characters, a 6-byte time stamp, and other.

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• Line category Serial (serial communication)
• Line category SerialOverUDP Device Redundant (serial communication).
• Line category RFC2217 Client (serial communication).
• Line category TCP/IP-TCP and TCP/IP-TCP Redundant (MODBUS over TCP/IP). Reserved TCP port 502 is commonly used in common, but it is possible to use any other one according to the setting of the device. The line number is not used, set the value e.g. to 1.
  Note: For redundant systems, it is possible to enter multiple names/addresses separated by commas.
  Note: In the case of WAGO 750-8100 type PLC and communication via MODBUS TCP, it was necessary to set a small polling period (e.g. 1 second) in the time parameters of the station. In the case of a longer period (5 seconds), the connection was closed quite often by the PLC.

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• First character defines a type of I/O tag:
  • I - Integer16 (default) - one register is read, signed
  • U - Unsigned16 - one register is read, unsigned
  • Uu - Unsigned16 - one register is read, unsigned, only upper byte is considered (1st in sequence)
  • Ul - Unsigned16 - one register is read, unsigned, only lower byte is considered (2nd in sequence)
  • f - Float (4 bytes = 2 registers) - two registers with Address and Address+1 are read and transmitted as big-endian (see Note).
  • F - Float (4 bytes = 2 registers) - two registers with Address and Address+1 are read and transmitted as little-endian (so-called Modicon format), (see Note)
  • L - Unsigned long (4 bytes = 2 registers) - two registers with Address and Address+1 are read, unsigned, and transmitted as big-endian (see Note)
  • Ll - Unsigned long (4 bytes = 2 registers) - two registers with Address and Address+1 are read and transmitted as little-endian, unsigned (see Note)
  • S - Signed long (4 bytes = 2 registers) - two registers with Address and Address+1 are read, signed, and transmitted as big-endian (see Note)
  • Sl - Signed long (4 bytes = 2 registers) - two registers with Address and Address+1 are read and transmitted as little-endian, signed (see Note)
  • B - Byte unsigned, only the upper 8 bits of the register value
  • X - Byte unsigned, only the lower 8 bits of the register value
  • sn. - Text string with the length of n characters, one register is one character, n registers with Address up to Address+n-1 are read
  • an. - Text string with the length of 2*n characters, one register is two ASCII characters, characters are transmitted in the same order as they appear in the string,  n registers with Address up to Address+n-1 are read
  • An. - Text string with the length of 2*n characters, one register is two ASCII characters, characters are transmitted in big-endian order (i.e. "1234" is transmitted as "2143"),  n registers with Address up to Address+n-1 are read
• Modifier d indicates that a number is an 8-byte number (4 consecutive registers). It can be used for types L, Ll, S, Sl, F,f, and it is used for configuration of signed/unsigned 8-byte integer as well as an 8-byte float (big-endian <B8>..<B1> and little-endian <B1>..<B8> formats).
  Modifier D indicates that a number is an 8-byte number (4 consecutive registers). It can be used for types Ll, Sl, F and it is used for configuration of signed/unsigned 8-byte integer as well as an 8-byte float (little-endian format <B2><B1><B4><B3><B6><B5><B8><B7>).
  Note: when using a modifiers modifier d or D, the I/O tag must be of Analog type (Ai), because Integer type (Ci) in D2000 is implemented as a 4-byte variable, and overflow might occur. Writing of Integer type (Co) as an 8-byte number is supported.
• Modifier b indicates that figure is coded by BCD. It can be used for I/O tags of I, U, B, L, Ll types.

• Modifier s indicates that a status register (Unsigned16) located on address Address is followed by a big-endian Float value located on address Address+1 .. Address+2. This indicator is used for type f and it is implemented for calorimeter Endress+Hauser RMS621. The following table shows the values of the status register and their mapping to D2000 attributes.

  Status register	D2000 attributes
  0: Invalid value	Weak
  1: Measured value valid	Valid
  2: Overflow warning 3: Overflow error 4: Underflow warning 5: Underflow error 6: Saturated steam alarm 7: Error in differential pressure calculation 8: Wrong medium for DP calculation 9: Wrong value range - DP calculation inaccurate 10: Differential pressure - general error 11: Range overshoot (Tsat > 350 etc.) on 12: Change in state of aggregation 26 : Differential pressure --> general error 99: No measured value is assigned to the register in the setup of the ModBus	Weak

  
  

• Parameter RdFn is a function of the Modbus protocol for a data reading. The following functions are implemented:
  • 1 - Read Coils: binary status reading
  • 2 - Read Discrete Inputs: binary input reading
  • 3 - Read Holding Registers: status register reading (Integer16/Unsigned16 and Float32 - reads two successive registers)
  • 4 - Read Input Registers: input register reading (Integer16/Unsigned16 and Float32 - reads two successive registers)
  • 0 - A value is not read, it is only written. The function for writing (WrFn) must be set.
• Parameter WrFn is the function of the Modbus protocol for data writing. The following functions are implemented:
  • 5 - Write Single Coil: binary status writing (default for Read Coils)
  • 6 - Write Single Register: status register writing (default for Read Holding Registers)
  • 16 - Write Multiple registers: multiple registers writing, it must be used when 2-register type is written (e.g. Float, Unsigned long, etc.).
    Note: function can be used to write more than two registers at once if a text string is used. Example:
    if we have an I/O tag with address a3.0-16.#8A00 (i.e. text string covering 3 registers, having length of 6 characters) and we write a string '123456', then hexadecimal values 0x3132, 0x3334 and 0x3536 (ASCII code for '1' is 0x31, for '2' is 0x32 etc) will be written to registers 0x8A00, 0x8A01 and 0x8A02.
  • 22 - Mask Write Register:  write affects only the value of the particular bit BitNr of the status register. It is usable only for Do value types with the address parameter BitNr.
• Parameter d activates the function "delayed write". Sending of the value is delayed until the request to write the value of the object without parameter d comes. All accumulated requests waiting to be written are sent. If the function WrFn is set to "Write Multiple Registers", the values are sent in one packet.
• Parameter Address is a 2-byte address of the register (0-65536). See also the protocol parameter Addressing model.
  Note: address can be specified as a hexadecimal number using a number sign (#), e.g. #50CE
• Parameter BitNr is a number of bit in a word. The values 0-7 are allowed to be used for binary statuses and inputs, values 0-15 are allowed to be used for reading of bit from 16-bit status or input registers.

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2. When values are read from two registers as big-endian the received bytes are analysed analyzed in this way:

Examples:

3. When values are read from two registers as little-endian, the received bytes are analysed analyzed in this way (if Little Endian Mode=2143):

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Examples:

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• configuration software ROCLINK800
• default login LOI, password 1000
• logging in FloBoss 103: click on DirectConnect (connection through COM1, on the side of FloBoss 103 it is connected to LOI-local interface)
• menu Configure->Modbus->Configuration
  set the parameter "Variable Mode" on station in D2000 according to setting "Byte Order":
  • if "Least Significant Byte first" then "Little endian"
  • if "Most Significant Byte first" then "Big endian"
• I/O tags are configured through menu Configure -> Modbus -> Registers on FloBoss 103
• following types are supported (n means 16-bit address):
  • Binary input:
    • address in D2000: 1.n, e.g. 1.1001, variable of Di/Dout type
    • address in FloBoss 103: variable of BIN type
      Function: 1
      Starting/ending register: n
  • Binary output:
    • address in D2000: 1.n, e.g. 1.1001, variable of Dout type
    • address in FloBoss 103: variable of BIN r/w
      Function: 1 (for reading)
      Starting/ending register: n
      Function: 5 (for reading)
      Starting/ending register: n
  • Unsigned Int 8 bits input:
    • address in D2000: x1.B3.n, e.g. x1.B3.1003, variable of Ci/Co type
    • address in FloBoss 103: variable of UINT8 type
      Function: 3A or 3B
      Starting/ending register: n
  • Unsigned Int 8 bits output:
    • address in D2000: x1.B3.n, e.g. x1.B3.1003, variable of Co type
    • address in FloBoss 103: variable of UINT8 r/w type
      Function: 3A or 3B
      Starting/ending register: n
      Function: 6
      Starting/ending register: n
  • Unsigned Int 16 bits input:
    • address in D2000: x2.U3.n, e.g. x2.U3.1004, variable of Ci/Co type
    • address in FloBoss 103: variable of UINT16 type
      Function: 3A or 3B
      Starting/ending register: n
  • Unsigned Int 16 bits output:
    • address in D2000: x2.U3.n, e.g. x2.U3.1004, variable of Co type
    • address in FloBoss 103: variable of UINT16 r/w type
      Function: 3A or 3B
      Starting/ending register: n
      Function: 6
      Starting/ending register: n
  • Signed Int 16 bits input:
    • address in D2000: x2.I3.n, e.g. x2.I3.1005, variable of Ci/Co type
    • address in FloBoss 103: variable INT16 type
      Function: 3A or 3B
      Starting/ending register: n
  • Signed Int 16 bits output:
    • address in D2000: x2.I3.n, e.g. x2.I3.1005, variable of Co type
    • address in FloBoss 103: variable of INT16 r/w type
      Function: 3A or 3B
      Starting/ending register: n
      Function: 6
      Starting/ending register: n
  • Unsigned Int 32 bits input:
    • address in D2000: x4.U3.n, e.g. x4.U3.1006, variable of Ci/Co type
    • address in FloBoss 103: variable of UINT32 type
      Function: 3A or 3B
      Starting/ending register: n
  • Unsigned Int 32 bits output:
    • address in D2000: x4.U3.n, e.g. x4.U3.1006, variable of Co type
    • address in FloBoss 103: variable of UINT32 r/w type
      Function: 3A or 3B
      Starting/ending register: n
      Function: 6
      Starting/ending register: n
  • Float 32 bits input:
    • address in D2000: x4.F3.n, e.g. x4.F3.1008, variable of Ai/Ao type
    • address in FloBoss 103: variable of FL type
      Function: 3A or 3B
      Starting/ending register: n
  • Float 32 bits output:
    • address in D2000: x4.F3.n, e.g. x4.F3.1008, variable of Co type
    • address in FloBoss 103: variable of FL r/w type
      Function: 3A or 3B
      Starting/ending register: n
      Function: 6
      Starting/ending register: n
  • String (N bytes) input:
    • address in D2000: x1N.C3.n, e.g. x10.C3.1010, variable of TxtI/TxtO type
    • address in FloBoss 103: variable of ACm(AC10,AC12,AC20,AC30,AC40) type
      Function: 3A or 3B
      Starting/ending register: n
  • String (N bytes) output:
    • address in D2000: xN.C3.n, e.g. x10.C3.1010, variable of Co type
    • address in FloBoss 103: variable of ACN r/w type (AC10,AC12,AC20,AC30,AC40)
      Function: 3A or 3B
      Starting/ending register: n
      Function: 6
      Starting/ending register: n
  • Time and date 6 bytes input:
    • address in D2000: x6.T3.n, e.g. x6.T3.1010, variable of TiA/TxtI type
    • address in FloBoss 103: variable of DT6 type
      Function: 3A or 3B
      Starting/ending register: n
    • Note 1: FloBoss 103 supports local and monotonous time - that is why the configuration of station in D2000 must correspond to configuration of FloBoss.
    • Note 2: It is possible to set time and date but it requires to configure configuring extra the I/O tags for a second, minute, hour, day, month, and year as Unsigned Int 8 bits and after that to write into them.

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