Siemens SIMATIC S7-300 Reference Manual page 558
Programmable logic controllers module data
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Glossary
Temperature errors of internal compensation
The temperature error of internal compensation only occurs during thermocouple
measurement. It identifies the additional error which is to be taken into account
and added to the actual temperature error when "internal comparison" mode is
selected. The data is either given as a percentage relative to the physical rated
range of the analog module or as an absolute value in °C.
Two-conductor/three-conductor/four-conductor connection
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 volt-
age output of an analog output module.
Two-wire transmitter/four-wire transmitter
Kind of transmitter (two-wire transmitter: supply (via terminals of the analog input
module; 4-wire transmitter: supply via separate terminals of the transmitter)
Ungrounded
Without galvanic connection to ground
User program
The user program contains all the statements, tags and data for signal process-
ing used to control a system or a process. It is assigned to a programmable
module (CPU, FM, for example) and can be structured in smaller units (blocks).
Wire-break
Parameter in STEP 7. A wire-break test is used for monitoring the connection
from the input to the encoder and from the output to the actuator. With wire-
break, the module detects a flow of current at the appropriately parameterized
input/output.
Glossary-10
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
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