ProSoft Technology CLX-PVX - Manual (Page 15)

QTS-CLX-PVX Page 9
Important Considerations
The operation of the QTS-CLX-PVX is different in several important ways from that of a
standard ControlLogix module and in some ways from a PROVOX controller.
It is essential that you be aware of the following:

the QTS-CLX-PVX in master mode write changes in the ControlLogix output data
table to PROVOX outputs even in program mode. If you make a change in the output
table, it will appear on the bus

in master mode, if the I/O configuration in the QTS-CLX-PVX changes, it is
essential that you clear the ControlLogix output table for the module before you
connect it to the Control I/O bus

the QTS-CLX-PVX continues to scan the Control I/O bus even if the the connection
to the ControlLogix processor is lost. This is so that I/O on the bus does not time out.

on the Control I/O bus, data is passed only when it changes. In monitor mode, the
QTS-CLX-PVX sees only data that changes while it is connected to the bus. In
master mode, the QTS-CLX-PVX writes outputs only when they change and receives
inputs only when they change.

configuring the QTS-CLX-PVX module requires that you reset the PROVOX
controller. This can cause major disruptions to the running system. Reset the
controller only when you know it is safe to do so. A reset can last up to 3 minutes.

if you switch from a real PROVOX scanner to a QTS-CLX-PVX scanner, you
should download the configuration to the QTS-CLX-PVX. This forces a reset on the
Control I/O bus. A reset is necessary because the two scanners implement the bus
token passing slightly differently. A reset ensures that all files and cards update.