Appendix MSX-E1516
Input level
The input level is the logarithmic ratio between
two electrical values of the same type (voltage,
current or power) at the signal input of any
receiving unit. This unit is often configured as a
logical level related to the input of the circuit.
The input voltage corresponding to logic “0” is
between 0 V and 15 V and the voltage
corresponding to logic “1” is between 17 V and
30 V.
IP degree of protection
The IP standard defines the degree of
protection of a system against dirt and water.
The first figure after the “IP” (e.g. 6 in IP 65)
indicates the degree of protection against solid
objects penetrating the housing. The second
figure indicates the degree of protection
against liquids penetrating the housing.
In IP 65, the figures 6 and 5 have the following
meaning: 6 = full protection against moving
parts and against dirt penetration;
5 = protection against jets of water from any
direction.
In IP 40, the figure 4 equates to protection
against contact with small objects and
protection against small foreign bodies (larger
than 1 mm). The figure 0 means that there is
no protection.
Level
Logic levels are defined for processing and
displaying information.
In binary switches, voltages are used for digital
values. Here, the two voltage ranges “H” (high)
und “L” (low) represent the information.
The “H” range is closer to plus infinity; the “H”
level corresponds to digital 1. “L” denotes the
range closer to minus infinity; the “L” level
corresponds to digital 0.
Limit value
Exceeding the limit values, even for a short
time, can easily result in the destruction of the
component or the (temporary) loss of
functionality.
MAC address
MAC = Media Access Control
This is the hardware address of network
components used to identify them uniquely
within the network.
Optical isolation
Optical isolation means that there is no flow of
electrical current between the circuit to be
measured and the measuring system.
Protective circuit
A protective circuit is set up on the actuator
side to protect the control electronics and
provide adequate EMC safety. The simplest
protective circuit involves connecting a resistor
in parallel.
Resolution
The resolution indicates how precisely a signal
or value is held within the computer.
Short-circuit
A short-circuit exists between two terminals of
an electric circuit if the relevant terminal
voltage is zero.
SOAP
= Simple Object Process Protocol
SOAP is a simple extensible protocol for
exchanging information in distributed
environments. It defines XML messages that
can be exchanged between heterogeneous
applications via HTTP. SOAP is independent of
operating systems and can be integrated into
existing Internet structures, including Ethernet
TCP/IP-based automation concepts. SOAP is
based on Remote Procedure Calls and XML.
This means that functions from other platforms
can be called and used from any point within
the network. Any results data can also be
returned using XML schemas.
This enables distributed computing capacity
and non-redundant data storage in distributed
systems.
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