História stránky

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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 used in common, but it is possible to use any other one according to setting of device. Number of line is not used, for example set the value 1.
  

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• 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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linka_parametre linka_parametre

Line protocol parameters

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A dialog window of communication line configuration - Protocol parameters tab.
They influence some optional protocol parameters.

The line protocol contains the following parameters:

A dialog window of communication line configuration - Protocol parameters tab.
They influence some optional protocol parameters.

The line protocol contains the following parameters:

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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 upper 8 bits of the register value
  • X - Byte unsigned, only 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),  n registers with Address up to Address+n-1 are read
• Modifier d indicates that the number is an 8-byte number (4 consecutive registers). It can be used for types L, Ll, S, Sl, F,f and it allows configuration of 8 byte integer with/without a sign as well as an 8-byte float (big endian <B8>..<B1> and little endian <B1>..<B8> formats).
  Modifier DModifier d indicates that the number is an 8-byte number (4 consecutive registers). It can be used for types L, Ll, S, Sl, F,f and  and it allows configuration of 8 byte integer with/without a sign as well as an 8-byte float (variants big endian and little endianlittle endian format <B2><B1><B4><B3><B6><B5><B8><B7>).
  Note: when using a modifier modifiers d or D, 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. Following table shows values of 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 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 Modbus protocol for a data writing. 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: it influences only value of the particular bit BitNr of status register. Usable only for Do types with the address parameter BitNr.
• Parameter d activates the function "delayed write". Sending of the value is delayed until the request to write value of the object without parameter d comes. All accumulated request waiting to be written are sent. If the function WrFn is set on "Write Multiple Registers", the values are sent in one packet.
• Parameter Address is 2-byte address of 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 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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• xN indicates the number of bytes that read or write. Valid values N are 1, 2, 4 (in combination with I, U, F), 6 for T type and optional figure arbitrary number for C type).
• A letter defines the type of I/O tag. In comparison with Beside standard I, U, F, B, there are two  two extra types have been added:
  • C - text string of fixed length (e.g. x10.C3.1001 is 10-sign character string on address 1001)
  • T - time stamp with length of 6 bytes (ss:mi:hh dd:mm:yy)
• A meaning of other parameters is in compliance with invariable mode.

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