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The start and stop functions change the operating mode of a device. The start function enables outputs and the stop function disables outputs. These functions are not supported for the PLC-2 family of devices.
Devices can control complex and perhaps dangerous industrial processes. Do not use the start and stop functions until you take the required safety precautions and required operating restrictions are put into effect. Refer to the manufacturer's documentation for specific safety precautions. |
The start function enables outputs and scanning on the PLC-1774 device. Using the STOP command when the keyswitch position is RUN/PROGRAM LOAD - RUN causes the status of the device to appear as Remote Test. A subsequent START command enables outputs.
Table 3-2 displays the keyswitch positions, current mode, request types, DAS activity, and resulting mode for the PLC-1774 while performing the start and stop functions.
| Keyswitch Position | Current Mode | Function | DAS Activity | Resulting Mode |
|---|---|---|---|---|
| PROGRAM LOAD | Program load | Start | Invalid mode | Program load |
| Program load | Stop | None | Program load | |
| TEST MONITOR | Test mode | Start | Invalid mode | Test |
| Test mode | Stop | None | Test | |
| RUN MONITOR | Run mode | Start | Enable outputs | Run |
| Run mode | Stop | Disable outputs | Run | |
| RUN/PROGRAM LOAD - RUN | Remote run | Start | Enable scanning,Enable outputs | Remote run |
| Remote run | Stop | Disable outputs | Remote test | |
| RUN/PROGRAM LOAD - TEST | Remote test | Start | Enable scanning | Remote test |
| Remote test | Stop | None | Remote test | |
| RUN/PROGRAM LOAD - PROG | Remote prog | Start | Invalid mode | Remote prog |
| Remote prog | Stop | None | Remote prog |
PLC-1774 outputs are disabled with a STOP command, but scanning is not stopped. |
The start function changes the current mode to Run. The stop function
changes the current mode to Program Load.
3.2.1.3 PLC-5
The Start function changes the device operating mode to Remote Run. The
Stop function changes the device operating mode to Remote Program. The
device keyswitch must be in the REM position for the start or stop
request to change the device's operating mode.
3.2.1.4 SLC
Start and Stop functions are not supported for SLC processores.
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