FloBoss 407 Instruction Manual
Rev 5/00
3-37
3.5.13.2 Verify Communications
Equipment Required:
Dual-trace Oscilloscope
In this test, the HART module and the ROC/FloBoss act as the host and transmit a polling request to
each HART device. When polled, the HART device responds. In this test, you use the oscilloscope to
observe the activity on the two HART communication channels. Note that there is normally one second
from the start of one request to the start of the next request.
1.
Attach one input probe to terminal B of the HART module and examine the signal for a polling
request and response for each HART device connected to this channel.
2.
Attach the other input probe to terminal C and examine the signal for a polling request and response
for each HART device connected.
3.
Compare the two traces; signal bursts should not appear on both channels simultaneously.
Keep in mind that each device on one channel is polled before the devices on the other channel are
polled. If a channel indicates no response, this could be caused by faulty I/O wiring or a faulty device.
If the HART module tries to poll both channels simultaneously, this could be caused by a defective
module, in which case the module must be replaced.
3.6 REMOVAL, ADDITION, AND REPLACEMENT PROCEDURES
3.6.1 Impact on I/O Point Configuration
When an I/O module is replaced with the
same type
of I/O module, it is not necessary to reconfigure
the ROC/FloBoss. Modules which are treated as the same type are:
♦
Discrete input isolated and source modules
♦
Discrete output isolated, source, and relay modules
♦
Analog input loop, differential, and source modules, and RTD input modules
♦
Pulse input isolated and source modules
♦
Slow pulse input isolated and source modules
If a module is to be replaced with one of the same type (see above), but some of its configuration
parameters need to be changed, you can use the ROCLINK software to make the changes off-line or
on-line. If you want to minimize “down time,” before you replace the module, you can make the
needed changes (except for ROC display and FST changes) off-line by first saving the ROC/FloBoss
configuration to disk. Modify the disk configuration, replace the module, and then load the
configuration file into the ROC/FloBoss.
Содержание Fisher FLOBOSS 407
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