Siemens S7-400PLC Specifikace stáhnout pdf (Strana 455)

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S7-400 Automation System Module Data

Reference Manual, Edition 09/2009, A5E00850736-06

455

Glossary

2-conductor/3-conductor/4-conductor connection

Method of connecting to the module, for example, connecting resistance thermometers or

resistors to the front connector of the analog module or loads to the voltage output of an

analog output module.

2-wire transducer/4-wire transducer

Type of transducer (2-wire transducer: Power supply via terminals of the

analog input module; 4-wire transducer: power supply via separate connectors of the

transducer)

Address

An address identifies a specific operand or range of operands, examples: input I 12.1;

memory word MW25; data block DB3.

Automation system

An automation system is a → programmable controller comprising a → central rack, a CPU

and various input/output modules.

Backplane bus

The backplane bus is a serial data bus over which modules communicate with each other

and over which they are supplied with the necessary voltage. The connection between

modules is established by bus connectors.

Backup battery

The backup battery ensures that the → user program on the → CPU is not lost in the event of

a power failure and that defined data areas, bit memory, timers, and counters are also

retained.

Backup voltage, external

The same backup can be achieved as with a backup battery if a backup voltage (direct

voltage between 5 V and 15 V) is applied to the "EXT.-BATT." socket of the CPU.

The external backup voltage is required to replace a power supply module if the user

program and data stored in a RAM (for example, bit memory, timers, counters, system data,

integrated clock) needs to be backed up while the module is exchanged.

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