Chapter 2 Devices *Time when the PLC status change action occurs: The data is stored as the values in the binary-coded decimal. The range of values is as follows. 9. The PLC operation flag SM400~SM403 SM400: The normally-open contact SM401: The normally-closed contact SM402: SM402 is ON during the first scan time, and then is switched OFF. The pulse width equals one scan time. Users can use this contact to do the initial setting. SM403: SM403 is OFF during the first scan time, and then is switched ON. That is, the negative pulse is generated the moment the PLC runs. The PLC runs. SM400 SM401 SM402 SM403 Scan time 10.
The initial clock pulse SM404~SM410, and SR409~SR410 The PLC provides seven types of clock pulses. When the PLC is supplied with power, the seven types of clock pulses act automatically. Users can set the interval of the clock pulse in SM409 and SM410.
2-89 Action *Time when the PLC status change action occurs Number number Year Month Day Hour Minute Second SR383 SR384 High byte SR384 Low byte SR385 High byte SR385 Low byte SR386 High byte SR386 Low byte 19 SR387 SR388 High byte SR388 Low byte SR389 High byte SR389 Low byte SR390 High byte SR390 Low byte 20 Function Value Year 00~99 (A.D.) Month 01~12 Day 01~31 Hour 00~23 Minute 00~59 Second 00~59 Device Function SM404 10 millisecond clock pulse during which the pulse is ON for 5 milliseconds and is OFF for 5 milliseconds SM405 100 millisecond clock pulse during which the pulse is ON for 50 milliseconds and is OFF for 50 milliseconds SM406 200 millisecond clock pulse during which the pulse is ON for 100 milliseconds