Intelligent Technologies Modbus to QCPort Adapter Manual
January 2006
MN05002002E (C)
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Page 28
Notice
With some PLC scanner cards it is important to stagger the scan rates when multiple
connections are employed on one D77D-EMA.
Adding or Removing Devices from QCPort
If at any time devices are added or removed from QCPort, the IO registers will have to be
revised using the Soft Configuration procedure or CH Studio. When a Soft Configuration
is performed, it erases the old register mappings and creates new ones based on the
remapped information from QCPort CHA and CHB.
Warning
When adding or removing a device and performing the Soft Configure procedure, the
IO register mappings are erased and recompiled. Because of this, data in the
controller registers may be different than prior to re-configuration. Care should be
taken to verify the register mapping before bringing the controller/D77D-EMA back
on-line.
When adding a new device to QCPort, it is desirable for register mapping to change as
little as possible (to minimize PLC programming changes). To achieve this, add the new
device at a Group ID that is larger than the largest ID currently on CHA (when only CHA
is used), when both channels are used, add to CHB. This will add the device to the end
of the IO register mapping, minimizing the programming changes within the controller.
When removing a device from QCPort, reprogramming of the IO data in the controller is
necessary. Remove the device and perform a soft configuration, this will remap all
register data within the Adapter.
Replacing an Existing Device on QCPort
It is possible to replace a QCPort device with a like device when the system is scanning
and active, a feature called “Hot Swap”. There are only a few rules to follow, they are:
•
The new device has to have the same product code as the replaced device (same
type of device). For example, if an MCC bucket (Cover Control) is to be replaced, the
new MCC bucket must have the same device type (Cover Control) as the old one. .
It is not permissible to replace non-like type of products with out performing a soft
configuration. For example a S811 soft start cannot replace a S751 soft start with a
cover control
•
The new device must have the same IO configuration as the replaced device. If the
IO configuration was changed from default (look in user manual for that device), then
a tool will be required to reconfigure the IO configuration to match.
Warning
Configuration parameters such as communication loss action, debounce times, initial
state, thresholds and fault/warnings enable/disable are not required to match. Once
the system is running, it is strongly suggested that a tool be used to synchronize the
old device settings to the new device. The hot swap feature is designed to bring a
system back up and running as quickly as possible with minimal user intervention
and may cause limited functionality.