Run / Stop / Reset - Hitachi MICRO-EHV+ Applications Manual

Chapter 3 Programming

3.13 Run / Stop / Reset

Run/Stop
CPU can be started with HX-CODESYS or Run/Stop switch on the CPU, but remote controlling with HX-CODESYS
is not allowed when the Run/stop switch is in Stop position as shown below.
Switch position
User operations
Stop with HX-CODESYS
Run with HX-CODESYS
Reboot PLC (Cycle power)
* CPU starts running independent from the last status before power failure.
Reset
When CPU detects a serious error called "exception", such as watchdog error, program execution stops. If
HX-CODESYS is connected, "Exception" indication blinks until this status is cleared. This exception status is cleared
only by "Reset" operation. HX-CODESYS has 3 different types of "Reset" operation: Reset warm, Reset cold and
Reset origin. All of them can initialize exception status, but behaviors of CPU are different as shown below. Be noted
that "Reset origin" initializes not only an exception but also your application and boot application in CPU module.
Operation
STOP
Reset warm
Reset cold
Reset origin
Download
Online Change
Reboot PLC
X = maintained, - = initialized
Stop switch definition
Definition of stop position of run/stop switch can be configured as "Stop" or "Reset warm" in CPU configuration.
Default setting is "Reset warm" since it is almost same behavior of original "Stop" for existing Hitachi PLC.
Stop (no effect)
Stop (no effect)
VAR VAR RETAIN
X X
- X
- -
- -
- -
X X
- X
STOP
Stop
VAR Application
PERSISTENT (in volatile memory)
X
X
X
-
X (overwritten)
X (modified)
X
3 – 34
RUN
Stop
Run
Run *
Boot application
(in non-volatile)
X X
X X
X X
- -
X
X
- X