Hart Command; Explanation Of The Hart Commands; Universal Hart Commands - Siemens SIMATIC ET 200SP HA Equipment Manual

SHC sequence
If the I/O module detects a HART command with a SHC bit set on a channel, then channel is
reserved for external HART commands for approx. 2 s. No more internal HART commands are
sent to the field device with this channel.
SHC sequence (Page 40)
Burst mode
The I/O module does not support burst mode. HART commands with set burst bit are ignored and
are not forwarded to the connected field device.
7.3.2

HART command

Definition
HART commands are used to set the configurable properties of HART field devices (HART
parameters). HART responses are used to read out the HART parameters.
Description
The HART commands and their parameters are divided into three groups:
• Universal HART commands (Page 39)
• General purpose HART commands (Page 40)
• Device-specific HART commands (Page 40)
7.3.3

Explanation of the HART commands

7.3.3.1

Universal HART commands

Definition
Universal commands must be supported by all manufacturers of HART field devices.
Description
Examples of universal HART commands:
Command
0
11
AQ 4xI HART ISOL HA
Equipment Manual, 07/2022, A5E50102497-AB
Function
Reads manufacturer and device type - only with this command 0 can field devices
be addressed by means of a short frame address
Reads manufacturer and device type
HART function
7.3 Communication
39