Printed in the Federal Republic of Germany
TR-Electronic GmbH 2018, All Rights Reserved
03/19/2021
TR-ECE-BA-DGB-0141 v03
Page 63 of 67
5.5.6 Encoder and dynamic error (watchdog)
As long as the position data can be measured and transmitted without errors, the
signal bit
Encoder error
is deleted and the signal bit
Dynamic error
supplies a
square-wave frequency of 250 Hz. In the case of an error, the
Encoder error
is set
and the
Dynamic error
stays at any level.
If it is possible the dynamic error instead of the encoder error should be use, since the
dynamic error is very likely to also detect faulty program execution in the device.
The following errors are reported:
-
Satellite scanning error (internal gear)
-
EEPROM reading error
-
Flash erasing error
-
Flash writing error
If the error is eliminated, the error can be deleted about the input "Preset" or if the
supply voltage is switched-off and then switched-on again.
5.5.7 Even parity, Even error parity
The parity bit serves as control bit for the error detection during SSI data
transmissions.
The parity represents the checksum of the bits in the SSI data word. If the SSI data
word contains an odd number of "1", the special bit Even Parity = "1" and supplements
the checksum to even parity. Therefore the Parity or Error Parity special bit must
always be defined at the last digit. It is calculated from all previous bits. About that,
only one single Parity special bit is possible.
By selection of the inverted Parity the
Odd Parity
or the
Odd Error Parity
can
be deduced.
If no encoder error is present, the error parity corresponds exactly to the normal parity.
In the case of an error, it is inverted. Its purpose is to make additional transmitting of
the encoder error unnecessary.
