Yaskawa MP940 - Manual (Page 50)

3.1 Operating Modes
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3.1 Operating Modes
This section explains the online operating mode and the offline stop mode, both of which indi-
cate the MP940 operating status.
Fig 3.1 MP940 Operating Modes
3.1.1 Online Operating Mode
When the power for the MP940 is turned ON, the RDY and RUN indicators will light (the
ALM indicators will not light), and the Module will enter the online operating mode. This
means that the user program and I/O operations are being executed in the MP940 without
any errors or failures. If an alarm does occur, such as for an I/O conversion error or a user
calculation 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 10 SERVOPACK
Inspection, Maintenance, and 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:
1. When the program memory has not been initialized (see * 1.)
2. When a serious failure, such as watchdog timer error, has occurred (see * 1.)
3. When a STOP operation has been performed from the CP-717 (see * 2.)
4. When the RUN/STOP switch has been set to OFF (STOP) and the power has been
turned ON (see * 3.)
Note: 1. The above cases apply when a user program error occurs, or when
there is a hardware fault in the MP940. For details on the error
content and the action to be taken, see Chapter 10 SERVOPACK
Inspection, Maintenance, and Troubleshooting.
2. The online operating mode is entered by performing a RUN oper-
ation.
Operating mode Online operating mode
RDY and RUN indicators lit
User program and I/O operation executing
Offline stop mode
RDY or RUN indicators unlit
User program stopped