User`s manual

12-1
M-net (Master Station) Function
12
12-1 M-net (master station) function
M-net (interface between modules) is a communication system which makes data exchange possible
between each type of equipment (such as programmable controllers, robot controllers, positioners,
measuring equipment, etc.) while also reducing installation materials and labor costs. The M-net
facilitates the construction of an automatic control facility for production.
When using the JW-32CUM1, use it as a master station 00
(8)
in the M-net. The JW-32CUM1 sends and
receives data to slave stations 01 to 07
(8)
. The slave stations do not communicate with each other.
Chapter 12: M-net (Master Station) Function
Master
station 00
(JW-32CUM1)
Slave
station 01
Slave
station 02
Slave
station 03
Slave
station 04
Slave
station 05
Slave
station 06
Slave
station 07
Number of stations
that can be connected: Max. 8 (including the master station)
Number of link points: Max. 512.
Total cable length: 1 km max.
Data communication system
Master station 00
(JW-32CUM1)
Transmitted
data to slave
station 01
Received data
from slave
station 01
Transmitted
data to slave
station 02
Received data
from slave
station 02
Transmitted
data to slave
station 07
Received data
from slave
station 07
Slave station 01
Slave station 02
Slave station 07
Received data
from the master
station
Transmitted
data to the
master station
Received data
from the master
station
Transmitted
data to the
master station
Received data
from the master
station
Transmitted
data to the
master station
Items Sharp specifications for M-net
M-net standard
specifications (reference)
Number of stations that
can be connected
Eight stations (one master station and seven slave
stations)
Same as on the left
Number of link points
Up to 512 points (a total of 64 bytes can be used for
transmission and reception from one station) *1
Up to 256 points (32 bytes)
Communication protocol EIA RS485 or equivalent Same as on the left
Data transmission speed 19.2 k bits/s, 38.4 k bits/s *2 19.2 k bits/s
Transmission
specifications
Equivalent to the M-net specifications ------
Bit configuration
One start bit, seven data bits, one even parity bit, and one
stop bit
Same as on the left
Data verification method Transmission data uses even parity Same as on the left
Synchronization system
Asynchronous system (Data is transmitted starting from
the LSB.)
Same as on the left
Communication system Half duplex system Same as on the left
Transmission circuit Maximum 1 km in cable total length
Maximum 100 m in cable total
length
Others Communications for PC operation are asynchronous -----
*1 When a JW-32CUM1 is used as the master station, up to 512 link points can be used. However,
when communicating with slave modules manufactured by other companies, be sure to check the
number of link points these stations can handle.
*2 Normally, transmit data at a speed of 19.2 k bits/s. When you want to transmit data at 38.4 k bits/s,
you must set every module in the network to 38.4 k bits/s.