Programming – Rockwell Automation T7491 ICS Regent+Plus Mixed I/O Modules User Manual

Page 16

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Multiplexed I/O Module (T7491)


1 6

Industrial Control Services

configuration and also when you load the application program
that controls the output.

Final Value

This field applies only to Mux output points. The final value
for the output is loaded to the Regent when the application
program that controls the output is deleted. Unless special
circumstances exist, you should always choose Off, so that the
output is turned off when you delete the application program
that controls the output. If you do not enter a final value, the
output will remain in its last state when you delete the
application that controls it.

Programming

Mux input points are used in application programs just like
any other simplex input. Contacts in ladder logic can be used
to examine the on or off status of the inputs.

Mux outputs have special programming considerations. The
Mux outputs can be programmed to any one of four possible
states: On, Off, Flash slow, and Flash fast. In order to control
the outputs in these four states a special Mux Coil instruction
is provided in ladder logic. This instruction is used along with
the standard coil instruction to control the Mux output. Table
2 illustrates which on/off combinations of the Coil and Mux
Coil instructions produce the four output states.

Table 2. Programming Mux Output States

Desired Output

State

Coil

--( )--

Mux Coil

--( M )--

Off

Off

Off

Flash Fast

On

Off

Flash Slow

Off

On

On

On

On

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