BEI Sensors PHU9 Absolute Hollow Shaft Encoder - Manual (Page 22)

PROFIBUS USER MANUAL
22 Preliminary
BEI IDEACOD SAS
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5.2 Data exchange in normal operation
With the manufacturer-specific versions BEI
IDEACOD 2.2 the process value generally is
transmitted as 32-bit-value (peripheral double
word). Apart from 25 bits used for the position
value the 7 other bits are used as status bits.
The output double word contains the preset
value and control bits.
Absolute encoders model series might have
(physical) position values > 25 Bit. The
manufacturer specific BEI IDEACOD versions
do not support the position values > 25 Bit. The upper digits will be overwritten by the status
bits. If the BEI IDEACOD versions are used with
encoders with a total (physical) resolution > 25
Bit, the user has to assure that the position
value is scaled to a maximum output value <
33554432. If position values > 25 Bit are
necessary class 2 should be used.
If version BEI IDEACOD 2.2 is used the current
velocity is transmitted in an additional
(peripheral) input word.
ID F1 hex D0 hex
Status + position value Velocity Slave Master
Status + 2 24 2 23 - 2 16 2 15 - 2 8 2 7 - 2 0 2 15 - 2 8 2 7 - 2 0
Preset value + control bits Master slave
Control + 2 24 2 23 - 2 16 2 15 - 2 8 2 7 - 2 0
Meaning of the different status bits:
Bit 28 Bit 27 Bit 26 Bit 25 Meaning
Ready
0 = encoder is not ready for operation
1 = encoder is ready for operation
Mode
0 = commissioning mode
1 = normal mode
Software limit switch
0 = lower limit switch current position value upper limit
switch
1 = current position value > upper limit switch or
current position value < lower limit switch
Code sequence
0 = increasing clockwise (view onto the shaft)
1 = increasing counter clockwise (view onto the shaft)