Siemens Automation System S7-400 - Manual (Page 133)

Commissioning
6-5
Automation System S7-400 Hardware and Installation
A5E00850741-01
According to the backup concept, Table 6-2 shows how you must set the battery
monitoring switch on the different power supply modules.
Table 6-2 Setting the Battery Monitoring Switch
If You ... ...Then
do not use battery monitoring, set the BATT INDIC switch to OFF.
use battery monitoring with a single-width
power supply module,
set the BATT INDIC switch to BATT.
want to monitor a backup battery with a
double or triple-width power supply module,
set the BATT INDIC switch to 1BATT.
want to monitor two backup batteries with a
double or triple-width power supply module,
set the BATT INDIC switch to 2BATT.
6.3 Connecting a Programming Device (PG) to an S7-400
Connecting a Programming Device (PG) to an S7-400
You must connect the programming device via a connecting cable to the MPI of the
CPU. This allows access via the communication bus to all CPUs and
programmable modules.
PG cable
S7-400
Programming device
Figure 6-1 Connecting PG to an S7-400