Panasonic FP3 - Page 143

FP3 MEWNET-TR
Chapter8-6. Page.141
137
[Link number for high-level link system]
“H link 1”, “H link 2” and “H link 3”
H link 3 (ET-LAN unit)
H link 2 (ET-LAN unit)
H link 1 (ET-LAN unit)
link unit:
Link units available for FP3 and FP10S are classified into two types: those for the
“standard link system” and those for the “high-level link system”.
Units for the “standard link system” and “high-level link system” are listed as:
- Units for the standard link system:
C.C.U. (Computer Communication Unit), C-NET Link Unit,
MEWNET-P (Optical) Link Unit, MEWNET-W (Wire) Link Unit
- Units for the high-level link system:
ET-LAN Unit, MEWNET-H Link Unit
malfunction:
Incorrect function.
Master Control Relay:
Arelaywhichcontrols anyseriesofprogramswithitsoperation.Ifthe mastercontrol
relayis de-energized,allof the contactsand devicescontrolled bythemaster control
relay are de-energized.
MEWTOCOL-COM:
A communication protocol for FP series programmable controllers that performs
communication between a computer and programmable controllers.
modem:
Abbreviation for MOdulator/DEModulator. The modem modulates digital signals
and transmits them through a telephone line.
Most Significant Bit (MSB):
The bit which represents the greatest value in a byte, word, or double-word.
Most Significant Digit (MSD):
The digit which represents the greatest value in a number.
multidrop link:
Acommunicationlinkinwhichonehostcancommunicatewithtwoor morestations.
noise:
Random, unexpected electrical signals, that are caused by radio waves or by
electrical or magnetic fields.
non-hold:
The memory area whose contents will be lost or modified if operating power is lost
or if the mode of the programmable controller is changed from RUN to PROG.
normally-closed contact:
A contact which is closed when the coil of the relay is not activated.
normally-open contact:
A contact which is open when the coil of the relay is not activated.
offline:
Not being in continuous communication with another processor.
online:
Being in continuous communication with another processor.
8-6. Terminology