Chapter 3 Functions; Self-Diagnosis Function (Common To St4-C11 / St4-C12Ex); Reset Operation (Common To St4-C11 / St4-C12Ex); Manual Reset - Panasonic ST4 Series Instruction Manual

Chapter 3 Functions

3-1 Self-diagnosis Function
(Common to ST4-C11 / ST4-C12EX)
The controller incorporates the self-diagnosis function.
The self-diagnosis is carried out when the power is turned ON, and while the
operation periodically.
In case an abnormality is detected during self-diagnosis, the device will be
in the lockout condition at that instant, and the control output (OSSD 1 / 2) is
fixed at the OFF condition. Refer to "Chapter 5 Troubleshooting" and re-
move the cause of the abnormality.

3-2 Reset Operation (Common to ST4-C11 / ST4-C12EX)

The selection of manual / auto reset at interlock is available for the control out-
put (OSSD 1 / 2).
Manual / auto reset can be selected by the wiring of the reset input terminals
(X1, X2, and X3).
Terminals Operation
X1-X2

Manual reset

X1-X3 Auto reset
3-2-1 Manual Reset
• The control output (OSSD 1 / 2) is not turned ON automatically even ST4-A□
receives the light beam.
• Reset button and back check circuit (KA, KB) are constructed between X1
and X2. When the back check circuit (KA, KB) is not required, only the reset
button is constructed.
• The device restarts at the start-up operation of the external reset button
when ST4-A□ receives the light beam.
<When the back check circuit is needed>
X1
<When the back check circuit is not needed>
X1
42
Reset button
Reset button
Install the reset switch so as to watch the whole dangerous area
constantly, and to be operated outside of that area.
© Panasonic Industrial Devices SUNX Co., Ltd. 2016
KA KB
X2
X2