ROC364 Instruction Manual
3-28 Input and Output Modules Rev Jun/05
3.5.13.2 Verify HART Communications
Equipment Required: Dual-trace Oscilloscope
In this test, the HART module and the ROC act as the host and transmit a polling request to each HART
device. When polled, the HART device responds. Use the oscilloscope to observe the activity on the two
HART communication channels. 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.
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
Use the following when removing, adding, or replacing I/O modules.
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. Modules that are treated as the same type include:
♦ Discrete Input Isolated and DI Source Modules.
♦ Discrete Output Isolated, DO Source, and DO Relay Modules.
♦ Analog Input Loop, AI Differential, AI Source Modules, and RTD Input Modules.
♦ Pulse Input Isolated and PI Source Modules.
♦ Slow Pulse Input Isolated and SPI Source Modules.
If a module is to be replaced with one of the same type, but configuration parameters need to be
changed, use ROCLINK configuration software to make the changes off-line or on-line. To minimize
“down time” before you replace the module, perform changes (except for ROC Display and FST
changes) off-line by first saving the ROC configuration to disk. Modify the disk configuration, replace
the module, and then load the configuration file into the ROC.
To make changes on-line, replace the module, proceed directly to the configuration display for the
affected point, and modify parameters as needed. Remember to consider the impact on FSTs and other
points that reference the affected point.
Any added modules (new I/O points) start up with default configurations. Even though adding a module,
removing a module, or moving a module to a new position in the ROC does not directly affect the
configuration of other I/O points, it can affect the numbering of I/O points of the same type. This, in
turn, can impact an FST or higher-level point because the referencing of I/O points is done by a
sequence-based point number.
(16 Seiten)
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