■
Range used by link relay
● The range of link relays that can be used varies depending on the type of network and unit
combinations.
● It is necessary to set the range of use and the number of points for each individual network.
■
Setting of hold type relay and non-hold type relay
● Link relays are categorized into two types, depending on how the relay operates after
powering off or switching from RUN to PROG. mode:
1. Hold type relay, which remembers the ON/OFF status immediately before the relay is
stopped, until operation resumes
2. Non-hold type relay, which resets the status when the relay is stopped
● You can set the range of hold and non-hold types in
Setting of the no. of local devices to
be used (in total)
>
Global hold-type start no.
in the "Memory configuration" dialog box
using the tool software FPWIN GR7.
● If you specify the beginning of a hold type relay using a word number, relays before that point
will be non-hold types, and subsequent relays will be hold types. For example, when the
Setting of the no. of local devices to be used (in total)
>
Global hold-type start no.
in the
"Memory configuration" dialog box is set to 10, L0 to L9F will be non-hold type, and L100 to
L63F will be hold type.
● Take note that when using a relay as a receiving link relay, even if you set the link relay to
hold type in the system configuration, hold operations will not be performed.
● Hold type and non-hold type settings can be set for each global device and local device.
■
Usage restrictions
● When used as contacts, there are no restrictions on the number of times that can be used.
● As a rule, when you specify the relay as the output destination of operation results (using OT
and KP instructions), the specification is limited to once in a program. (Double output is
prohibited)
● You can also enable duplicate output using the setting for
Duplicate output
authorization
>
Select operation
in the "CPU configuration" dialog box. Additionally, use of
SET or RST instruction is not regarded as duplicate output.
2.5 Explanations about Relays
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