Yaskawa MP930 - Manual (Page 61)

Basic System Operation
3.1.2 Offline Stop Mode
3 -2
3.1 Operating Modes
This section explains the online operating mode and the offline stop mode, both of which indicate
the MP930 operating status.
Operating mode Online operating mode
D RDY and RUN LEDs lit
D User program and I/O operation executing
Offline stop mode
D RDY or RUN LED not lit
D User program stopped
Figure 3.1 MP930 Operating modes
3.1.1 Online Operating Mode
When the power for the MP930 is turned ON, the RDY and RUN indicators will light
(the ERR and ALM indicators will not light) and the Unit will enter the online operating mode.
This means that the user program and I/O operations are being executed in the MP930 without
any errors or failures. If an alarm does occur, such as for an I/O conversion error or a user cal-
culation error, the execution of the user program will not stop, and the online operating mode
will be maintained. The ALM indicator lights to indicate the occurrence of an error. For details
on the error content and the action to be taken, see Chapter 9 Troubleshooting.
3.1.2 Offline Stop Mode
The execution of the user program is stopped, and all outputs are reset (i.e., “0” is output for
all digital outputs). The RUN or RDY indicator will go OFF to indicate the status. Drawings
(DWG.H and DWG.L) are not executed in this status.
The Controller will be in the offline stop mode in the following four cases:
D When a scan time has not been set (see note 1)
D When the program memory has not been initialized (see note 1)
D When a serious failure, such as watchdog timer error, has occurred (see note 2)
D When a STOP operation has been performed from the CP-717 (see note 2)
D When the RUN/STOP switch has been set to OFF (STOP) and the power has been turned
ON (see note 3)
Note The above cases apply when a user program error occurs, or when there is a hard-
warefaultinthe MP930.Fordetailsonthe errorcontentandthe actiontobetaken,
see Chapter 9 Troubleshooting.
3