Hitachi MICRO-EHV+ - 3.13 Run; Stop; Reset

Chapter 3 Programming
3 – 34
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
RUN
Stop with HX-CODESYS
Stop (no effect)
Stop
Run with HX-CODESYS
Stop (no effect)
Run
Reboot PLC (Cycle power)
Stop
Run *
* 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
VAR
VAR RETAIN
VAR
PERSISTENT
Application
(in volatile memory)
Boot application
(in non-volatile)
STOP
X
X
X
X
X
Reset warm
-
X
X
X
X
Reset cold
-
-
X
X
X
Reset origin
-
-
-
-
-
Download
-
-
X
(overwritten)
X
Online Change
X
X
X
(modified)
X
Reboot PLC
-
X
X
-
X
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.