Proline Promass 83E/F/O Modbus RS485 Operating Instructions

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OperationProline Promass 83 Modbus RS485INTEGER:Selection1 – 0 – 3 – 2 *3 – 2 – 1 – 00 – 1 – 2 – 32 – 3 – 0 – 11stByte 1(MSB)Byte 0(LSB)Sequence2ndByte 0(LSB)Byte 1(MSB)* = Factory settingMSB = most significant byteLSB = least significant byteSTRING:Illustration using the example of a device parameter with a data length of 18 bytes.SequenceSelection1st 2nd … 17th 18th1 – 0 – 3 – 2 *3 – 2 – 1 – 0Byte 1 Byte 0(LSB)… Byte 17(MSB)Byte 160 – 1 – 2 – 32 – 3 – 0 – 1Byte 0(LSB)Byte 1 … Byte 16 Byte 17(MSB)* = Factory settingMSB = most significant byteLSB = least significant byte5.5.6 Modbus error messagesIf the Modbus slave detects an error in the request telegram from the master, it sends a reply to themaster in the form of an error message consisting of the slave address, function code, exception codeand check sum. To indicate that this is an error message, the lead bit of the returned function codeis used. The reason for the error is transmitted to the master by means of the exception code.The following exception codes are supported by the measuring device:Exception codesDescription01 ILLEGAL_FUNCTIONThe function code sent by the master is not supported by the measuring device (slave).! Note!Description of the function codes supported by the measuring device ä 45.02 ILLEGAL_DATA_ADDRESSThe register addressed by the master is not assigned (i.e. it does not exist) or the length of therequested data is too big.03 ILLEGAL_DATA_VALUE• The master is attempting to write to a register which only allows read access.• The value that appears in the data field is not permitted: e.g. range limits overshot orincorrect data format.04 SLAVE DEVICE FAILUREThe slave did not respond to the request telegram from the master or an error occurred whenprocessing the request telegram.Page 48 • MN0M030Issue/Rev. 0.2 (12/12)
Proline Promass 83 Modbus RS485Operation5.5.7 Modbus auto-scan bufferFunction descriptionThe Modbus master uses the request telegram to access the device parameters (data) of themeasuring device. Depending on the function code, the master gains read or write access to a singledevice parameter or a group of consecutive device parameters. If the desired device parameters(registers) are not available as a group, the master has to send a request telegram to the slave foreach parameter.The measuring device has a special storage area, known as the auto-scan buffer, for groupingnonconsecutive device parameters. This can be used to flexibly group up to 16 device parameters(registers). The master can talk to this complete data block by means of just one request telegram.Structure of the auto-scan bufferThe auto-scan buffer consists of two data records, the configuration area and the data area. In theconfiguration area, a list known as the scan list specifies which device parameters should begrouped. For this purpose, the corresponding register address, e.g. the register address 2007 formass flow, is entered in the scan list. Up to 16 device parameters can be grouped.The measuring device cyclically reads out the register addresses entered in the scan list and writesthe associated device data to the data area (buffer). The request cycle runs automatically. The cyclestarts again when the last entry in the scan list has been queried.By means of Modbus, the grouped device parameters in the data area can be read or written by themaster with just one request telegram (register address 5051 to 5081).Configuration of the scan listDuring configuration, the Modbus register addresses of the device parameters to be grouped mustbe entered in the scan list. The scan list can contain up to 16 entries. Float and Integer-type deviceparameters with read and write access are supported.The scan list can be configured by means of:1. The local display or a configuration program (e.g. FieldCare).The scan list is configured here by means of the function matrix:BASIC FUNCTION Modbus RS485 SCAN LIST REG. 1 to SCAN LIST REG. 162. The Modbus master.Here, the scan list is configured via the register addresses 5001 to 5016.Scan listNo.Modbus configurationRegister address(data type = Integer)Configuration vialocal operation / configuration program(BASIC FUNCTION Modbus RS485 )1 5001 SCAN LIST REG. 12 5002 SCAN LIST REG. 23 5003 SCAN LIST REG. 34 5004 SCAN LIST REG. 45 5005 SCAN LIST REG. 56 5006 SCAN LIST REG. 67 5007 SCAN LIST REG. 78 5008 SCAN LIST REG. 89 5009 SCAN LIST REG. 910 5010 SCAN LIST REG. 1011 5011 SCAN LIST REG. 1112 5012 SCAN LIST REG. 12Issue/Rev. 0.2 (12/12) MN0M030 • Page 49
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The specifications contained herein
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Proline Promass 83E/F/O Modbus RS485 Operating Instructions

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