GE VersaMax PLC User Manual page 145

Input/ Output
Reset
Pattern
Dwell Time
Fault Timeout
Control Block
Length
ok
OUT
Drum Coil
Dwell Timeout
Timeout Fault
First Follower
Instruction Set Reference
For public disclosure
Choices
The Reset input can be used to select a specific step in the sequence.
When Enable and Reset both receive power flow, the function copies
the Preset Step value in the Control Block to the active Step
flow
reference, also in the Control Block. Then the function block copies
the value in the Preset Step reference to the Out reference bits. When
Reset is active, the function ignores the Step input.
The starting address of an array of words, each representing one step
of the Drum Sequencer. The value of each word represents the
R, AI, AQ
desired combination of outputs for a particular value of Active Step.
The number of elements in the array is equal to the length input.
This optional input array of words has one element for each element in
the Pattern array. Each value in the array represents the dwell time for
the corresponding step of the Drum Sequencer in 0.1 second units.
R, AI, AQ,
When the dwell time expires for a given step the Dwell Timeout bit is
none
set.
If a Dwell Time is specified the drum cannot sequence into its next
step until the Dwell Time has expired.
This optional input array of words has one element for each element in
the Pattern array. Each value in the array represents the fault timeout
R, AI, AQ,
for the corresponding step of the Drum Sequencer in 0.1 second units.
none
When the fault timeout has expired the Fault Timeout bit is set.
The beginning reference address of the function's parameter block.
The length of the Control Block is 5 words. A more complete
R
description of what is contained within this block is listed below.
Value between 1 and 128 that specifies the number of steps.
CONST
OK is energized if Enable is On and no error condition is detected. If
flow, none
Enable is Off, this output will always be Off.
I, Q, M, T, G, A word of memory containing the element of the Pattern Array that
R, AI, AQ corresponds to the current Active Step.
This optional bit reference is set whenever the function block is
I, Q, M, T, G,
enabled and Active Step is not equal to Preset Step.
none
This optional bit reference is set if the dwell time for the current step
I, Q, M, T, G,
has expired.
none
This optional bit reference is set if the drum has been in a particular
I, Q, M, T, G,
step longer than the step's specified Fault Timeout.
none
This optional array of bits has one element for each step of the Drum
I, Q, M, T, G,
Sequencer. No more than one bit in the array is On at any time and
none
that bit corresponds to the value of the Active Step
Description
GFK-1503E User Manual 145