Starting Up
6-6
S7-400 and M7-400 Programmable Controllers, Installation Manual
C79000-G7076-C424-01
6.4 Switching On an S7-400 for the First Time
Switching On an S7-400 for the First Time
First switch on the power cutout.
Then set the standby switch of the power supply module from the standby setting
to the I setting (output voltages at rated value).
Result:
On the power supply module, the green 5 VDC and 24 VDC LEDs light up.
On the CPU
– The yellow CRST LED lights up;
– The yellow STOP LED flashes for three seconds at 2 Hz. During this time
the CPU automatically executes a reset.
– The yellow STOP LED lights up after the automatic reset.
If the red BAF LED and one of the yellow LEDs (BATTF or BATT1F or BATT2F)
light up on the power supply module, check the backup battery/batteries, the
setting of the BATT INDIC switch, or read the section on controls and indicators of
the power supply modules in Chapter 3 of the
Reference Manual
.
Switching On an H System for the First Time
First switch on the master device and then the standby device. In each case,
proceed as described above.
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