About SIEMENS 6ES5951-7LB21 POWER SUPPLY

SIEMENS 6ES5951-7LB21 POWER SUPPLY

Power supply modules gener ate the voltages required by the programmable controller from the external power supply:

+ 5 V as supply voltage for all modules;
+ 5,2 V as supply voltage for the PG 605 programmer, the OP 393 and OP 396 operator panels and the BT 777 (observe max. current);
+ 24 V for the 20 mA current loop interfaces.

Power supply modules are available with one or two backup batteries, depending on the model. These can be replaced even when the power supply is switched off. In the case of the power supply modules with only one backup battery, the backup voltage is supplied via sock ets during replacement. In those with two backup batter ies, the second battery be gins to supply the backup voltage as soon as the first one fails. This also applies when it is removed for re placement.
Five power supply modules are available for the S5 115U/H programmable controller.