Masterless Communication Method; Use Of Insulated Rs485 - Panasonic FP (Sigma) Specifications

FPΣ (Sigma)
Optimised communication functions
1-channel RS232C type.
2-channel RS232C type.
1-channel RS485 type.
1-channel RS232C + 1-channel RS485 type.
With the RS485 type communication cassette...
Despite being compact you can create powerful PLC links!
More links than you imagined a compact PLC could achieve
(2,048 link relays / 256-word link data registers)
Can be used to share product type between different machines.
Can be used for interlocking between different machines.
Easy wiring between PLCs with twin-core cabling.

Masterless communication method

(when PLC linkage is achieved with link relays and link data registers)
The masterless communication method means that even if a connected device (station) goes into power off, operations to
automatically switch the master station continue. Start up is smooth and the recovery from malfunctions is also potentially faster.
Previous models
Usual master-slave communication
If the master station is not on,
communication cannot take place.
Errors occur when devices are not
turned on in sequence.
Master
station
Slave Slave
station station

Use of insulated RS485

Uses the insulated RS485, which is highly reliable and largely impervious to noise.
High-speed communication over long distances are enabled.
Transmission speed: Max. 115.2kbits/s
6
Slave Slave
station station
Four types of communication cassettes enable:
efficient connection to serial devices
transmission speeds of up to 115.2kbits/s
long transmission distance of up to 1200m
In addition, the green screw terminal is removable
for easy wiring.
With the FPΣ (Sigma)
Masterless communication using the FPΣ (Sigma)
Even if a station goes into a power-
off state, communications between
the other stations continue.
Link
station
Transmission distance: Max. 1.200m
02/2006
Link data register Link data register Link data register
Product type data Product type data Product type data
Process Assembly
machine machine
RS485
Link Link
station station
Inspection
machine
Link
station