User guide

Chapter 7: HART Channel Configuration, Data, and Status 67
Enabling and Using HART on theEnabling and Using HART on the
Enabling and Using HART on theEnabling and Using HART on the
Enabling and Using HART on the
1756sc-IF8H and OF8H1756sc-IF8H and OF8H
1756sc-IF8H and OF8H1756sc-IF8H and OF8H
1756sc-IF8H and OF8H
This chapter outlines the detailed settings and configuration related to
HART communication for the 1756sc-IF8H and 1756sc-OF8H modules.
These settings determine how the modules acquire HART data.
The chapter is broken down into the following sections:
• Configuring the modules for HART
• How the modules send and receive HART data
• HART protocol overview
Configuring theConfiguring the
Configuring theConfiguring the
Configuring the
Modules forModules for
Modules forModules for
Modules for
HARTHART
HARTHART
HART
ConfConf
ConfConf
Conf
iguring the IF8H Module figuring the IF8H Module f
iguring the IF8H Module figuring the IF8H Module f
iguring the IF8H Module f
or (Haror (Har
or (Haror (Har
or (Har
tt
tt
t
Acquisition/Communication)Acquisition/Communication)
Acquisition/Communication)Acquisition/Communication)
Acquisition/Communication)
• In order for HART to be active on any given channel, the channel
configuration must contain the following basic settings:
• Bit 7 (Enable HART), in the If8h0Configuration.ChXConfigBits tag,
needs to be set. See chapter 5 for more details.
• An appropriate ADC filter range must be selected.
!
Attention: The 1000Hz ADC filter setting is notAttention: The 1000Hz ADC filter setting is not
Attention: The 1000Hz ADC filter setting is notAttention: The 1000Hz ADC filter setting is not
Attention: The 1000Hz ADC filter setting is not
allowed when HART is enabled.allowed when HART is enabled.
allowed when HART is enabled.allowed when HART is enabled.
allowed when HART is enabled.
• The If8h0Configuration.ChXInputRange tag must be set to 4 for a 4 to
mA current range.
!
Attention: Attention:
Attention: Attention:
Attention:
HART throughput time can beHART throughput time can be
HART throughput time can beHART throughput time can be
HART throughput time can be
improved by disabling HART communication on improved by disabling HART communication on
improved by disabling HART communication on improved by disabling HART communication on
improved by disabling HART communication on
unusedunused
unusedunused
unused
channels or channels that include non-HART devices.channels or channels that include non-HART devices.
channels or channels that include non-HART devices.channels or channels that include non-HART devices.
channels or channels that include non-HART devices.
Chapter 7