Panasonic FP3 - Page 144

FP3 MEWNET-TR
Chapter8-6. Page.142
138
overflow:
The act of exceeding the maximum limit in a registers capacity.
parity check:
A check method for the number of 1s in a character when data communication is
performed. The parity check is performed by calculating the number of ones in a
character.
PC link:
The term “PC link” means one of the link functions between programmable
controllersthatuse specifiedrelaysand dataregisters. Inthe PClink,you donot have
to make a complicated program for communications. The PC link function is
available separately for the standard link system and the high-level link system as
follows:
[PC link for standard link system]
In the standard link system, a maximumof two PC links are available per CPU using
MEWNET-P (Optical) or MEWNET-W (Wire) link units. The two PC links for the
standard link systems are called “PC link S0” and “PC link S1”. For each link
communication,1,024pointsoflink relaysL and128wordsoflinkdata registersLD
are used for communications.The PC link S0 and S1 allocations can be set using
system register 46* as follows:
- when system register 46 = K0, between two MEWNET-P or MEWNET-W
linkunits usedforPClink, PClink S0isassignedfor theunitnearestto theCPU
(unit with a smaller S link number).
- when system register 46 = K1, between two MEWNET-P or MEWNET-W
link units used for PC link, PC link S0 is assigned for the unit farthest from the
CPU (unit with a larger S link number).
* System register 46 is available for FP3C series with CPU version 4.4 or later
and all FP10Ses.
[PC link for high-level link system]
In the high-level link system, a maximum of two PC links are available per CPU
using MEWNET-H link units. The two PC links for the high-level link systems are
called “PClink H0” and“PClink H1”. For each link communication,youcan assign
relays and registers used for link communications using setting tools.
The PC link H0 and H1 allocations are decided by the position of the MEWNET-H
link units. Between the two MEWNET-H link units used for the PC link, PC link H0
is assigned for the unit nearest to the CPU (unit with a smaller H link number), and
PC link H1 for the unit farthest from the CPU (unit with a larger H link number).
peripheral device:
Devices that are connected to the programmable controller.
PLC:
Abbreviation for Programmable Logic Controller. See programmable controller.
potentiometer:
A simple transducer which works based on resistance change.
programmable controller:
A control device which can be programmed to control process or machine
operations. A programmable controller is often referred to as a PLC when
abbreviated.
RAM:
Random Access Memory.RAMprovides an excellent means for easily creating and
altering a program. Many of the FP series programmable controllers use RAM with
battery backup for the application memory.
8-6. Terminology