User`s manual

Remote I/O (master station) function
9-8
9
9-3 Required transfer time and its timing
[1] Required transfer time
Time necessary to communicate with all the slave stations (T1)
N: Total number of I/O module points of all the slave stations. (The value is the numbers of I/O bytes
x 8 points.)
P: Numbers of slave stations. (Setting value of SW4)
U: The numbers of special I/O module for JW20H/JW30H installed on the slave stations.
Set time when the number of slave station is 1 (T1)
[2] PC process and communication timing
Communication by the JW-32CUM1 (general purpose communication section) is synchronized with the
processing of the JW-32CUM1 (control section). For this, the remote I/O executes processing as follows:
(1) Configuration of remote I/O master station (JW-32CUM1)
T1 = + + 2.3P + 0.8 (ms)
N
153.6
200U
153.6
T1 = + + 2.3 + 0.8 + 2.2 (ms)
N
153.6
200U
153.6
JW-32CUM1
Receiving
Sending
SIO
Buffer
memory
CPU2
Data
bus
Data
memory
CPU1
I/O module
General purpose communication
section (remote I/O master station)
Control section
Buffer memory: Stores output data to the remote I/O slave stations and inputs data from the remote
I/O slave stations.
CPU2: This is a CPU of the remote I/O, and controls the data exchange between the buffer
memory and the data memory of the PC, as well as SIO control.
SIO: This is a control circuit for serial communication.
Data memory: Data memory of the PC.
CPU1: Exchanges data with the remote I/O master station, executes the I/O processing and
PC processing.