P/W Pc Link Response Time - Panasonic FP3 Technical Manual

4-6. Communication Times

2. P/W PC Link Response Time

The P/W PC Link Response time is the time between an input transition at one station and the corresponding
output transition to another station.
In this section, the P/W PC Link Response Time is explained using the following example :
[EXAMPLE]
Station number 01
(UNIT NO. 01)
Programmable Controller
Program
X 0
Synchronous with CPU
scan operation
In the above example, the operation flow from an input transition to an output transition is explained as follows :
The operation of station number 01
(UNIT NO. 01)
Input transition
The external input realy X 0 in the Programmable
Controller 01 is turned ON.
I/O Update
At the time of I/O update in the CPU scan[station
number 01(UNIT NO. 01)], the X 0 status in taken into
CPU.
Program execution
The external input relay X 0 turns ON and the L 0 turns
ON.
PC Link buffer
update
The buffer in the W Type(Wire) Link Unit at station
number 01(UNIT NO. 01) is updateed at the P/W PC
Link update time in the CPU scan, after the buffer is
ready to be updated.
Token reception
When the first token is passed after the reception of the buffer update signal, the send area data in the buffer is prepared for
transferred.
Data distribution
The data are actually distributed during one transmission cycle time plus the transmission time needed for next station .
50
Station number 02
(UNIT NO. 02)
Programmable Controller
Program
L 0 L 0
Asynchronous Synchronous with CPU
operation scan operation
The operation of station number 02
(UNIT NO. 02)
Buffer update signal
To confirm the buffer availability, the buffer update
signal is transmitted during the link buffer update time.
PC Link buffer
update
The data in the buffer at station number 02 is transferred
to the CPU memory.
Program execution
The link relay L 0 turns ON and Y10 turns ON.
I/O Update
At the time of I/O update in the CPU scan[station
number 02(UNIT NO. 02)],the Y10 status is updated.
Output transition
The external output relay Y10 in the Programmable
Controller 02 is turned ON.
Y10