CPU Specifications
and Operation
4–23
CPU Specifications and Operation
The discrete input points are noted by an
X data type. There are 8 discrete input
points and 256 discrete input addresses
available with DL05 CPUs. In this
example, the output point Y0 will be
turned on when input X0 energizes.
Y0
OUT
X0
The discrete output points are noted by a
Y data type. There are 6 discrete outputs
and 256 discrete output addresses
available with DL05 CPUs. In this
example, output point Y1 will be turned
on when input X1 energizes.
Y1
OUT
X1
Control relays are discrete bits normally
used to control the user program. The
control relays do not represent a real
world device, that is, they cannot be
physically tied to switches, output coils,
etc. They are internal to the CPU.
Because of this, control relays can be
programmed as discrete inputs or
discrete outputs. These locations are
used in programming the discrete
memory locations (C) or the
corresponding word location which
contains 16 consecutive discrete
locations.
In this example, memory location C5 will
energize when input X6 turns on. The
second rung shows a simple example of
how to use a control relay as an input.
C5
OUT
X6
Y10
OUT
C5
Y20
OUT
Timer status bits reflect the relationship
between the current value and the preset
value of a specified timer. The timer
status bit will be on when the current
value is equal or greater than the preset
value of a corresponding timer.
When input X0 turns on, timer T1 will
start. When the timer reaches the preset
of 3 seconds (K of 30) timer status
contact T1 turns on. When T1 turns on,
output Y12 turns on. Turning off X0
resets the timer.
Y12
OUT
T1
TMR T1
K30
X0
Input Points
(X Data Type)
Output Points
(Y Data Type)
Control Relays
(C Data Type)
Timers and
Timer Status Bits
(T Data type)
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