NSD ABSOCODER NCW-3DNECMP Specifications & Instruction Manual page 80

APPENDIX 2-3. DC-Synchronous (SM2/Sync0/Sync1)
DC-Synchronous (SM2/Sync0/Sync1) is a synchronous mode with SYNC0 / SYNC1 event. This mode does the
OUTPUT data processing with synchronizing the SYNC0 event and INPUT data processing with synchronizing
the SYNC1 event.
For more detail, refer to the figure (Synchronous with SM2/Sync0/Sync1) below.
For NCW-3DNEC, following data is categorized in OUTPUT or INPUT.
- OUTPUT data: PRESET, error clear
- INPUT data: Position data, status input
SM2 event occurs when NCW-3DNEC receives the communication frame sent from the EtherCAT master.
Thus it includes the jitter by the EtherCAT master.
The SYNC0 event and SYNC1 event can occur by specifying the time in order to prevent affecting slaves from the
jitter. The OUTPUT data and the INPUT data are synchronized with each event.
Slave devices can be synchronized with high accuracy less than 1μs by using the DC (Distributed Clocks)
function.
The position data can be read in real time because SYNC1 event can close to communication frame by adjusting
the time.
NOTE
The EtherCAT master with "Class A" is needed when using the DC-Synchronous function.
PLC/NC Task
O Calc
I
Communication
Frame
Frame
I
：INPUT
O
：OUTPUT
U
：User Shift(Slave)
SM2 Event
SYNC0 Event
U
1C32: 02
1C32: 05
1C33: 02
1C32: 09
1C32: 06
OUTPUT Latch
OUTPUT Valid
Figure: Synchronous with SM2/Sync0/Sync1
PLC/NC Task
O
I
SYNC1 Event
1C33: 09 1C33: 06
INPUT Valid
INPUT Latch
73
SM2 Event
Calc
SYNC0 Event
Communication
Frame
Frame
U
: Output Mapping
: Output
: Input
: Input Mapping