User manual

Operation of EZ
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Circuit diagram
The circuit diagram is that part of the program where the
contacts are connected together. In RUN mode a coil is
switched on and off in accordance with the current flow and
the coil function specified.
Function relays
Function relays are program elements with special functions.
Example: timing relays, time switches, counters. Function
relays are elements provided with or without contacts and
coils as required. In RUN mode the function relays are
processed according to the circuit diagram and the results are
updated accordingly.
Examples:
Timing relay = function relay with contacts and coils
Time switch = function relay with contacts
Relay
Relays are switching devices which are electronically
simulated in EZ. They actuate their contacts according to their
designated function. A relay consists of at least a coil and a
contact.
Contacts
You modify the current flow with the contacts in the EZ circuit
diagram. Contacts such as make contacts carry a 1 signal
when closed and 0 when open. Every contact in the EZ circuit
diagram can be defined as either a make contact or a break
contact.
EZ500_700.book Page 75 Tuesday, May 3, 2005 5:15 PM