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03/2006
Actions for PLC
The following steps with the PLC start-up switch S4 will cause a
general reset
PLC GENERAL RESET:
1. Turn to position "2" (STOP operating state)
2. Turn to position "3" (MRES operating state, request general reset) and hold
3. Within 3 second, turn to the
4. Once the PS and PF LEDs are lit, turn the switch S4 to position "0"
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:
© Siemens AG 2006 All Rights Reserved
SINUMERIK 840D/810D Start-Up Guide (IADC) – 03/2006 Edition
⇒ PS LED lights up.
in this position (for approx. 3 second) until the PS STOP LED lights up
again.
⇒ PS LED goes out and comes on again.
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
⇒ 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.
/S7H/ SIMATIC Step7-300
5 Power-On and Power-Up
5.4
Power-On and Power-Up
5
5-43
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