695
Rotary Encoders
4
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Consider the General Notes on the Information in the Pepperl+Fuchs Product Catalogs
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Ethernet
The absolute rotary encoders with Ethernet interface support TCP/IP,
EtherNet/IP, Powerlink, and PROFINET IO protocols. Parameterization is
carried out using the Java Applets provided by the internal web server.
The protocols provided enable data to be transferred from the control
level to the plant periphery and back in a quick and verifiable manner,
which enables parameterization, diagnosis, and remote maintenance.
Code types
Binary code
Binary code is the classic code of the dual number system.This code can
be used to perform calculations as is the case with the decimal number
system. It is a multistep code.
This encryption can be used to change several bits at the same time from
step to step. If the transition from seven to eight is executed, bits 0, 1, 2,
and 3 change.
To ensure high transfer safety, it is recommended that you use a code
where just one bit changes from step to step. The evaluating control unit
can then check whether the associated condition has been fulfilled and,
if this is not the case, implement the necessary fault repair.
Gray code
The Gray code is a one-step code.
If you look at the transitions from step to step, you can see that just one
bit changes in each case.To calculate using this code, it must first be con-
verted into a binary code. This code type is recommended if the data is
transferred via a parallel interface. In order to check the single-step code,
each code change must be detectable by the test logic.
Gray excess code
The Gray excess code, also known as the capped gray code, is an extract
from the complete Gray code. It is always symmetrically capped, so only
even-numbered extracts can be used. The logic behind this is that an-
other number of measuring steps can be achieved when this is required
by the power of two. For instance, there is often a need to reduce a 9-bit
value (512 measuring steps) to 360 measuring steps.The one-step code
remains unaffected.
Application Notes for Rotary Encoders for
Hazardous Areas
"
Flameproof enclosure“ type of protection
(
EEx d) DIN EN 50016/VDE/0170/0171 Part 5
"
Type of protection where the parts that can ignite a potentially explosive
atmosphere are placed in an enclosure which can withstand the pressure
caused by an explosion inside the housing and prevents the transmission
of the explosion to the surrounding explosive atmosphere."
The housings are not gas-tight but have a flameproof joint that acts as a
pressure relief opening. Any emerging gases are cooled down to such an
extent that they are unable to ignite a potentially explosive atmosphere
outside of the housing. Ignition is prevented if the minimum ignition tem-
perature and the minimum ignition energy of the surrounding potentially
explosive atmosphere are not reached.The apparatus for this type of pro-
tection is therefore permitted for explosion groups I, IIA, IIB, and IIC with
different minimum joint lengths and maximum joint widths (see Tables 1
and 2 of EN 50018) depending on the type of joint.
The most important detail in the flameproof enclosure "d" type of protec-
tion is the flameproof joint that can be neither enlarged (rough removal of
rust) nor made smaller (lubrication with resinous fat).
If apparatus is used that is protected through flameproof enclosure, the
electric lines are usually installed on the basis of the "increased safety"
type of protection.
The devices in series 14 and 74 are designed in accordance with the
"
flameproof enclosure" type of protection with EC-Type Examination Cer-
tificate ZELM 02 ATEX 0078.
Introduction
