5
Vertical Mounting
All Units except the C16P and C4K can be positioned vertically.
C20P-CN411
Set to Right in Left out
CPU
I/O Unit
1-1-3
Analog Timer Unit
Internal variable resistors
These variable resistors are used to set the timers
and, from left to right, correspond to T0 to T3. The
settings of these resistors are effective only when the
corresponding IN/EXT selector is set to IN. To set or
adjust the time, use the screwdriver supplied with the
Analog Timer Unit. Turn the variable resistor shafts
clockwise to increase the time value.
Min.
Max.
Two M4 mounting screws
(self-rising pressure plate)
Indicators
The SET indicators in the top
row light while timer values
are being set. The TIME UP
indicators in the bottom row
light when the corresponding
timer contact (T0 to T3) turns
ON. Numbers 00 to 03 corre-
spond to T0 to T3.
This connector is not used.
Do not remove the cover.
External variable resistor connectors
When using external variable resistors to set the timers, connect the
resistors to these connectors. The corresponding IN/EXT selector
must be set to the EXT position. These connectors correspond to
T0 to T3 from left to right. Use 20 k
W
external variable resistors. A
Connecting Cable with a 2-m lead is available for a variable resistor
(C4K-CN223).
CPU connector
Install and connect the Expansion
I/O Unit and the CPU horizontally;
otherwise the Analog Timer Unit
cannot be connected to the CPU.
I/O Connecting Cable
C4K-CN502
One cable is supplied with the
Analog Timer Unit
IN/EXT selectors
When using the internal variable
resistor, set the corresponding pin to
IN; when using an external variable
resistor, set the corresponding pin to
EXT. These selectors correspond to
T0 to T3 from left to right.
Nomenclature
Section 1-1
