Name
Bytes
Function
Default
DS
IX
SX
SSI_EN
1
SSI function
00h
80h
310Ch
09h
*) This parameter may only be transferred at STOP state.
As soon as the module is adapted to the encoder and the parameter
SSI function
is activated, the module starts with sending the clock
signal and evaluating the encoder values. The received values are
stored in the input area.
4.2 In-/Output area
4.2.1 Input area 6byte
At CPU, PROFIBUS and PROFINET the input respectively output
area is embedded to the corresponding address area.
IX - Index for access via CANopen
SX - Subindex (6000h + EtherCAT-Slot) for access via EtherCAT
More can be found in the according manual of your bus coupler.
Addr. Name
Bytes
Function
IX
SX
+0
EV_I
4
Encoder value
5410h
01h
+4
C_US
2
16bit µs value
5411h
02h
Here the current encoder value as double word may always be found.
If the SSI function is disabled the encoder value still remains.
With missing the power supply of the encoder the encoder
value
F ... Fh as binary code respectively
A ... Ah as gray code is returned.
In the SLIO module there is a 16bit timer (μs ticker). With PowerON
the timer starts counting with 0. After 2
16
-1μs the timer starts with 0
again.
At SSI module with each encoder value the value of the timer is
stored as 16bit value in the input area. This timer value corresponds
to the 1. active clock edge for the encoder and so to the time when
the encoder value was stored in the output shift register of the
encoder. On this way speed measuring may be realized.
If the μs value in the Listening mode remains constant,
then the current encoder value is invalid.
Encoder evaluation
Input area
Encoder value
16bit µs value
VIPA System SLIO FM 050S
Deployment
In-/Output area > Input area 6byte
HB300 | FM | 050-1BS00 | GB | 15-11
38
