SICK AG
WHITEPAPER
SUPPLEMENTARY NOTES FOR EES/EEM37 MOTOR FEEDBACK SYSTEMS
AUTHOR
Christian Lohner
Product manager, motor feedback systems, SICK STEGMANN GmbH
SUMMARY
This supplementary note is only valid for EES/EEM37 Motor Feedback Systems and describes the deviation of EES/EEM37 Motor
Feedback Systems according to Hiperface DSL
®
Specication as well as the recommended work arounds
Irrtümer und Änderungen vorbehalten
2 8021843/2017-08-30WHITEPAPER | SICK
SUPPLEMENTARY NOTES FOR EES/EEM37 MOTOR FEEDBACK SYSTEMS
1. Deviation of EES/EEM37 Motor Feedback Systems according to Hiperface DSL
®
Specication
No HW Version SW Version DSL Master
IP-Core
Version
Description Severity Planned Fix Workaround
1 EES/EEM 37-0
(standard)
HW_A and later
EES/EEM 37-2
(safe)
HW_A and later
EEX-0_1.00
2016-03-16
(standard)
and later
EEX-0_1.00
2016-03-16
(safe)
and later
V01.00 and
later
The lcDSL V3 interface ASIC
used in the EES/EEM37 enco-
ders contains an error when
specifying position widths of less
than 24 bits. When doing so, an
“acceleration overow” error will
be raised any time the position
crosses the 0 boundary. Also,
an invalid position character will
be transmitted on the Horizontal
Channel. The absolute position
is not affected by this error. No
safety function is affected by
this error. All EES37 (single-turn)
encoders have position widths of
less than 24 bits and are therefo-
re affected. All EEM37 (multi-
turn) encoders have position
widths of more than 24 bits and
are not affected.
Moderate Next lcDSL
ASIC silicon
revision
No date
planned
See chapter
2.1
2 EES/EEM 37-0
(standard)
HW_A and later
EES/EEM 37-2
(safe)
HW_A and later
EEX-0_1.00
2016-03-16
(standard)
and later
EEX-0_1.00
2016-03-16
(safe)
and later
V01.00 and
later
When re-connecting the DSL
link to the EES/EEM 37 encoder
while the encoder shaft is in
motion, the DSL Master IP-Core
will indicate an “Acceleration
Overow Error”. Under these con-
ditions the error has no meaning.
Low Next lcDSL
ASIC silicon
revision
No date
planned
See chapter
2.2
3 EES/EEM 37-0
(standard)
HW_A and later
EES/EEM 37-2
(safe)
HW_A and later
EEX-0_1.00
2016-03-16
(standard)
and later
EEX-0_1.00
2016-03-16
(safe)
and later
V01.00 and
later
On startup the encoder shows
the “Conguration error” bit.
Low Next lcDSL
ASIC silicon
revision
No date
planned
Next lcDSL
ASIC silicon
revision
No date
planned
See chapter
2.3
4 EES/EEM 37-0
(standard)
HW_A and later
EES/EEM 37-2
(safe)
HW_A and later
EEX-0_1.00
2016-03-16
(standard)
and later
EEX-0_1.00
2016-03-16
(safe)
and later
V01.00 and
later
On startup the encoder shows
the “Acceleration overow” bit
Low Next lcDSL
ASIC silicon
revision
No date
planned
See chapter
2.4
SUPPLEMENTARY NOTES FOR EES/EEM37 MOTOR FEEDBACK SYSTEMS