Table of Contents
Advertisement
User Manual
GFK-1503F
Figure 155
The control word stores the state of the boolean inputs and outputs of its associated
function block in the following format:
Figure 156
Bits 0 through 11 are used for timer accuracy; not for counters.
If the Preset Value (PV) is not a constant, PV is normally set to a different location than the
second word. Some applications use the second word address for the PV, such as using
%R0102 when the bottom data block starts at %R0101. It is then possible to change the
Preset Value while the timer or counter is running. The first (CV) and third (Control) words
can be read but should not be written, or the function will not work.
10.9.1
Timer and Counter Functions on Delay Stopwatch Timer
A retentive On-Delay Stopwatch Timer (ONDTR) increments while it receives power flow
and holds its value when power flow stops. Time may be counted in tenths (0.1), hundredths
(0.01), or thousandths (0.001) of a second. The range is 0 to +32,767-time units. The state
of this timer is retentive on power failure; no automatic initialization occurs at power-up.
When this function first receives power flow, it starts accumulating time (current value).
When this timer is encountered in the ladder logic, its Current Value is updated.
Instruction Set Reference
Chapter 10
Jan 2020
165
Advertisement
Table of Contents
