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03.96
5.2 Power on and power-up
5-80
Siemens AG 2000 All Rights Reserved
SINUMERIK 840D Installation and Start-Up Guide (IAD) – 04.00 Edition
Perform the following operating steps with PLC start-up switch S4 to generate a
GENERAL RESET of the PLC:
1. Turn switch to setting “2” (operating state STOP)
⇒ PS LED lights up.
2. Turn switch to setting “3” (MRES state, request general reset) and hold in
this position (approx. 3 seconds) until PS STOP LED lights up again
⇒ PS LED goes out and lights up again.
3. Within 3 seconds, turn switch to settings
STOP–MRES–STOP (“2”–“3”–“2”)
⇒ PS LED flashes first at a frequency of approx. 2 Hz and then displays a
continuous light again
⇒ PF LED lights up.
4. After PS and PF LEDs light up, turn switch S4 to setting “0”
⇒ PS and PF LEDs go out and LED PR (green) lights up
⇒ The PLC program memory is now erased, PLC is operating in cyclic
mode.
Note
If a reset followed by an acknowledgement is triggered in position “3”, as is the
case for GENERAL RESET, the entire SRAM of the PLC is erased, i.e. both the
system data blocks and the diagnostics buffer are erased. These data can no
longer be accessed. The system data blocks must be loaded 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
STOP to MRES to STOP within 3 seconds after a general reset has been
requested.
References: /S7H/, SIMATIC STEP7–300
5.2.3 MMC100 – MMC102/103 power-up
When the power supply is switched on, the MMC powers up automatically. The
system software is installed in the factory and is ready to run. The basic display
appears on the screen if the MMC has powered up successfully.
Operation for PLC
general reset
MMC100/102/103
power-up
5 Power On and Power-Up
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