WirelessHART Fieldgate SWG70 Instructions d'exploitation télécharger pdf (Page 66)

10 Engineering WirelessHART Fieldgate SWG70

64 Endress+Hauser

10.2.2 Input Status

Input Status allows the Modbus mapping of a device with single or multiple binary output. As

Fieldgate SWG70 supports extended registers, values are normally assigned to the registers with the

reference addresses 100001 to 165536. The reference addresses are obtained by adding the register

number to 100,000. The dialogue checks for completeness of entries (line turns red if not correctly

filled out) as well as double assignment to the registers (line turns yellow).

The algorithm assumes that the discrete device delivers a maximum of 256 packed discrete values,

each of comprising 16 bits of an unsigned Integer16 (UINT16). Each bit represents a unique input

status. Fieldgate SWG70 first splits the data into two bytes and reserves 8 registers for each byte,

i.e. one for each bit contained.

• Least significant byte (Bits 0 - 7) maps e.g. to registers 100001 - 100008

• Most significant byte (Bits 8 - 15) maps e.g. to registers 100009 - 100016

The value entered after the byte selection determines which of the packed discrete values is to be

mapped, e.g. 0 will map the first set of packed discrete values and 15 the sixteenth set of packed

discrete values. More information is to be found in Appendix A.2.2.

NOTE!

• Some HART devices map their discrete value and status as PV in HART CMD 3. In this case the

value and status information will be found in the appropriate Input or Holding Register,

see Chapter 10.2.3.

• If a device status is mapped as a UINT8 to the Input Status registers, the status will be found in

only one of the bit registers, e.g. in Bit 0. The UINT8 is stored as a 16-bit value, the MSB being

filled with "0"s, see Chapter A.1.3.

1 Click on the Engineering =>Modbus Mapping =>Input Status leaf to display the

associated parameters:

2 Click on Generate to open the Generate tab

– The significance of the parameters is described in the table overleaf

1 2 ... 61 62 63 64 65 66 67 68 69 70 71 ... 123 124

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WirelessHART Fieldgate SWG70 Instructions d'exploitation Page 66