5
03/2006
5.4 Power-On and Power-Up
5-43
© Siemens AG 2006 All Rights Reserved
SINUMERIK 840D/810D Start-Up Guide (IADC) – 03/2006 Edition
The following steps with the PLC start-up switch S4 will cause a
PLC GENERAL RESET:
1. Turn to position “2” (STOP operating state)
⇒ PS LED lights up.
2. Turn to position “3” (MRES operating state, request general reset) and hold
in this position (for approx. 3 second) until the PS STOP LED lights up
again.
⇒ PS LED goes out and comes on again.
3. Within 3 second, turn to the
STOP-MRES-STOP (“2”–“3”–“2”) positions
⇒ PS LED PS first flashes at approx. 2 Hz and then lights up again
⇒ PF LED lights up
4. Once the PS and PF LEDs are lit, turn the switch S4 to position “0”
⇒ The PS and PF LEDs goes out and the PR LED (green) lights up
⇒ A general reset of the PLC is complete. It is now in cyclical mode.
Note
If a hardware RESET or POWER ON is initiated in switch position 3 on PLC
start-up switch 4 the entire SRAM contents of the PLC are initialized, the
diagnostic buffer contents are not deleted. All user data have to be transferred
again.
If setting “3” (MRES) is selected for less than 3 seconds, then no general reset
is requested. The STOP LED does not light up if the switch is not changed from
setting STOP to MRES to STOP within 3 seconds after a general reset has
been requested.
Reference material: /S7H/ SIMATIC Step7-300
Actions for PLC
general reset
5 Power-On and Power-U
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