Emerson PaCSystems VersaMax Series, Руководство пользователя

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User Manual Chapter 10
GFK-1503F Jan 2020
Instruction Set Reference 172
Parameters of the Off-Delay Timer Function
Input/
Output
Choices Description
address R
The function uses three consecutive words (registers) of %R
memory to store the following:
• Current value (CV) = word 1.
• Preset value (PV) = word 2.
• Control word = word 3.
Do not use this address with other instructions.
Careful: Overlapping references cause erratic operation of the
timer.
enable flow When enable receives power flow, the timer’s current value is
incremented.
PV
I Q, M, T, G, R, AI,
AQ, constant, none PV is the value to copy into the timer’s preset value when the
timer is enabled or reset. For a register (%R) OV reference, the
PV parameter is specified as the second word of the address
parameter. For example, an address parameter of %R0001
would use %R0002 as the PV parameter.
Q flow, none
Output Q is energized when the current value is less than the
preset value. The Q state is retentive on power failure; no
automatic initialization occurs at power-up.
time tenths, hundredths,
or thousandths of
seconds Time increment for the low bit of the PV preset and CV current
value.
10.9.4 Timer and Counter Functions Up Counter
The Up-Counter function counts up to a designated value. The range is 0 to +32,767 counts.
When the Up-Counter reset is ON, the Current Value of the counter resets to 0. Each time
the enable input transitions from OFF to ON, the Current Value increments by 1. The current
value can be incremented past the Preset Value PV. The output is ON whenever the Current
Value is greater than or equal to the Preset Value. The state of the CTU is retentive on power
failure; no automatic initialization occurs at power-up.
Figure 166