Siemens M7-400 Manual De Usuario

Glossary-19

S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07

A system function block (SFB) is a 

³

 function block integrated in the operating

system of the CPU that can be called in the STEP 7 user program like a function
block (FB), as required. The associated instance data block is in working
memory.

Parameter in STEP 7 for analog input modules when measuring temperatures
with a resistance thermometer (RTD). The temperature coefficient you select de-
pends on the resistance thermometer being used (to DIN standard).

Rate of data transmission (bit/s)

Method of connection to the module – for example, of resistance
thermometers/resistors to the front connector of the analog input module or of
loads at the voltage output of an analog output module.

Kind of transmitter (two-wire transmitter: supply (via terminals of the analog input
module; four-wire transmitter: supply via separate terminals of the transmitter)

Without galvanic connection to ground

The user program contains all the statements, 

³ 

declarations and data for signal

processing required to control a system or process. It is assigned to a
programmable module (CPU, FM, for example) and can be structured in smaller
units (blocks).

Voltage-dependent resistor