Siemens Automation System S7-400 User 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

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