Signal Status Signal Contents
When Using an Absolute Linear
Encoder
PAO First signal Upper 16-bit data (with sign)
Lower 20-bit data (pulse train)
During normal operation Incremental pulses
PBO First signal Lower 20-bit data (pulse train)
During normal operation Incremental pulses
PCO Always Origin pulse
The PAO (Encoder Divided Pulse Output) signal outputs the position data from the abso-
lute linear encoder after the control power supply is turned ON.
The position data of the absolute linear encoder is the current stop position. The absolute
linear encoder outputs the upper 16-bit data (with sign) according to the specified pro-
tocol. The absolute encoder outputs the lower 20-bit data as a pulse train. It then outputs
pulses as an incremental linear encoder (incremental operation status).
The host controller must have a reception circuit (e.g., UART) for the position data from
the absolute linear encoder. The pulse counter at the host controller will not count pulses
when the upper 16-bit data (with sign) (communications message) is input because only
phase A is input.
The output circuits for the PAO, PBO, and PCO signals use line drivers. Refer to the fol-
lowing section for details on line drivers.
Ä
Chap. 5.6.4 ‘I/O Circuits’ page 122
7.10.5 Reading the Position Data from the Absolute Linear Encoder
The sequence to read the position data from the absolute linear encoder of a Linear Ser-
vomotor is given below.
The upper 16-bit position data (with sign) are sent according to the transmission specifi-
cations.
The lower 20-bit data is output as a pulse train.
Sigma-7 Series SERVOPACKs
Application Functions
Absolute Linear Encoders > Reading the Position Data from the Absolute Linear Encoder
| | PROFINET Communications - SIEP YEUOC7P 02A Revision 0 | en | 241
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