Spectrum-controls 1734sc-IE2CH Manual do Utilizador descarregar pdf (Página 49)

Chapter 4: IExCH and HART 4-9

User’s Manual Pub. 0300257-01 Rev. A

HART Get Device Information - Reply packet structure

Offset Field Value Definition

102-103 Expanded Device Type Code (2 bytes) CMD#0, Byte 2 if HART Rev < 7

CMD#0, Bytes 1-2 if HART Rev

>= 7

104-107 HART PV Lower Range (4 bytes – Floating Point Value) CMD#15, Bytes 3-6

108-111 HART PV Upper Range (4 bytes – Floating Point Value) CMD#15, Bytes 7-10

112-115 Damping Value (4 bytes – Floating Point Value) CMD#15, Bytes 11-14

116 Write Protect Code (1 byte) CMD#15, Byte 15

117 Pad_2 for alignment (1 byte)

118 - 119 Private Label Mfg 16Bit (2 bytes) CMD#0, Byte 1 if HART Rev < 7

CMD#0, Bytes 19-20 if HART

Rev >=7

Sending the Get HART Device Information Message

The following rung will send an unconnected message to read the HART device

Information.

This is the message configuration dialog box

4.3.3 HART Pass-through Messaging

The HART Pass-Through Command can be used to send any HART command including

universal, common practice or device specific, directly to a field device via ladder.

All HART pass-through commands require a series of messages to be exchanged. First, a

pass-through init must be sent to the HART module to initiate the pass-through

command. The HART module will respond to the request with a request reply that

includes a handle that can be used to obtain the pass-through message response. Once the

handle is received, the user may issue a pass-through query to obtain the status of the

Get HART Device

Info Service Code

HART Instance 1

for Channel 0

HART Object Class

1 2 ... 44 45 46 47 48 49 50 51 52 53 54 ... 83 84

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Spectrum-controls 1734sc-IE2CH Manual do Utilizador Página 49