№
SX-DCT00221 -
51-
Panasonic Corporation
13-8
．
Communication timing
<Information>
1) Time is counted from the rising edge of stop bit.
2) Time allowed from receiving one character code until receiving the next character code can be set
by
Pr65 "Protocol timeout".
If the next normal character code cannot be received within the time set by this parameter, the ampli-
fier detects communication timeout and received data is canceled.
If communication timeout is detected continuously, and the number of detections exceeds the num-
ber of retrials (Pr64), the amplifier trips because of RS485 communication error.
3) When the host sends data and still does not receive any response from the amplifier, communication
error may be present through effect of noise, etc. In this case, the host should send data again after
time set by Pr65 “Protocol timeout”.
<Communication establishing time when power is turned on>
Establishment communication takes about 800 ms when the amplifier is powered on.
The amplifier does not make response in the meantime, therefore allow waiting time longer than a sec-
ond.
[Timing in power-on]
Symbol
Name
Value
T1
Communication response time (Amplifier)
Set by Pr5d.
T2
Communication response time (Host)
Take interval 10ms or longer.
T3
Data emitting time from amplifier to host after bus is occupied 0 – 2 ms
Host
→
Motor
Motor
→
Host
Motor bus occupied
Request
for sending
ACK/NAK
(Result response)
Data transfer
T1 or above
T2
T3
0-2 ms
T3
0-2 ms
T3
0-2 ms
T3
0-2 ms
EOT
Motor power supply
Host
→
Motor
Motor
→
Host
Power ON
Waiting time longer
than 1 second
Request for sending
Communication
established 800 ms
Response
T1 or above
