SMAR HI302, User Manual

Page: 62 / 92

Troubleshooting
8.2
Problem Solution
Once set at UPDATED, the HI302
does not start to poll the device or
the variables haven’t been
updated.
•
Check if the Polling is enabled in the HIRT.POLL_CTRL parameter.
•
Check if the command selected in the HIRT.POLL_CMD parameter corresponds to
the command desired. Each command reads different HART variables and updates
a different group of parameters.
The block does not start the
operation.
•
Check if the block is working: MODE_BLK.ACTUAL = AUTO and BLOCK_ERR =
PowerUp.
•
Check if the TAG that has been written on the DEV_TAG_SEL parameter is the
HART_TAG and not the HIRT block TAG.
•
Check if the HIRT.HCD_SEL[2] is configured properly.
The read value does not
correspond to the HART
device variable.
•
Check if BLK_EXEC_STATE = UPDATED. The parameters related to the HART
variable can only be read if the BLK_EXEC_STATE = UPDATED.
•
Check if the HIRT.HCD_SEL[ 1 ] parameter configuration corresponds to the HART
device version. The default value is 5 and corresponds to the Version 5 of the
Universal command.
•
Check if the HIRT.HCD_SEL[2] parameter corresponds to the device specific
configuration.
•
For the HVT block, make sure the read parameter corresponds to the desired
variable. See the HVT block allocation map.
I can’t write in the parameter.
•
Does the parameter correspond to a HART variable that can be written?
•
Check the HCD_SEL parameter configuration.
•
Even for the HIRT block, check if the device supports the HART command used for
writing. See the Appendix section, a detailed explanation about the commands
used by the HIRT block.
When attempting to program a
new firmware (a new version
of the resident program), the
FBTools displays a new error
message. Check if the HI302 is in Bootloader mode. In this mode, only the ON (green),
SAVING (yellow), and H
1 (green) LEDs must be lit. To access the Bootloader
mode, press the RESET button one time, with the module started up. By
pressing again the RESET button after the programming is done, the module
will start executing the new resident program.
Next see some of the most common questions about the HI302:
1. Does the HART Communication interfere with the 4-20mA Control Signal?
No. The HART Communication is imposed by a signal modulated in FSK (Frequency Shift
Keying) over the current signal generated or received by the device, in a frequency
ranging from 500 Hz to 4 KHz. According to the theory of communications, a signal
modulated in FSK has an average value equal to 0, and therefore no disturbance is
caused on the control signal. Thus, the HI302 module may be connected to any existing
installation.
2. Does the HI302 Module work with Third party Devices, that is, those not made by
Smar?
Yes. HI302 was designed to work with any devices that comply with HFC (HART
Communication Foundation) norms. The most used universal and common practice
commands are supported by the HI302 module through the HIRT block, with no need for
a special command configuration. If the user wants to use the device’s complete set of
commands (Common Practice and Specific Commands), a specific configuration must be
loaded in the module, based on the device documentation. For Smar devices, this
configuration is already built in the HI302’s memory.
3. Does the HART Channel need termination?
No. Due to the low communication range ( 1 200 bps) and the signaling through the current
modulation, there’s no need for using a terminator.