Chapter 4: OE2CIH and HART
4-5
User’s Manual Pub. 0300272-03 Rev. B
Table 4-2. HART Refresh Sequence
Commands sent to refresh Device Information on Configuration Change Detected
Command:
Definition:
Comment:
38
Reset Configuration Changed Flag
Resets the Configuration Changed
Response Code, Bit 36 of the
Transmitter Status Byte. Secondary
Master devices (address 0) should not
issue this command. Primary Master
devices (address 1) should issue this
command only after the Configuration
Changed Response Code has been
detected and acted upon.
12
Read Message
See Table 4-1
13
Read Tag, Descriptor, Date
See Table 4-1
15
PV upper and lower range values
See Table 4-1
16
Read Final Assembly Number
See Table 4-1
48
Read Additional Device Status
See Table 4-1
50
Read Dynamic Variable Assignments
See Table 4-1
The following table describes the class service code and instances required to
send the Read Additional Device Status message.
The module manages different priority levels of issuing the commands to refresh
the device information data based upon whether pass-throughs are active during
this time. Asset software may be trying to configure the device, or it may be
performing a calibration sequence that needs as much bandwidth as possible
4.2.4 HART Pass-Through Interface
The module will provide a mechanism to send HART messages to a HART
device on any of the channels using the CIP unconnected messaging interface.
This is called HART pass-through because the module is just directly sending the
requested HART message to the HART device and then returning the reply to the
requester.
There are three different pass-through interface types made available to support
multiple client requests for pass-through at the same time. The three types are
User Ladder, RSLogix, and Asset SW (Connects or DTM).
All three interface types have equal priority:
•
The User Ladder interface uses a simplified HART interface (EZ-HART)
that only requires the user to send the HART Command number along
with its data bytes (if any) in the request data for the Init Pass-through
message without having to know how to format a real HART message.
In addition, the Ladder interface has a MsgReady indicator tag in the
Input table to facilitate determining when the pass-through is complete.
•
The RSLogix and Asset SW interfaces require creating a complete
HART message (without preambles) as defined by the HART protocol
specifications.
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