2.5.6 C Counter
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How counter (C) works
● When the decrement-type preset counter is activated and the counter value reaches zero,
the counter contact with the same number as the counter turns ON.
● When the counter's reset input is turned ON, the counter contact turns OFF.
● All counters are hold type.
Cn：ON
Counter contact: ON
n: Counter no.
Count input
Reset input
Counter no.
CT n
U0
Cn
Count up
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Usage restrictions
● When used as contacts, there are no restrictions on the number of times that can be used.
2.5.7 L Link relay
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How link relay (L) works
● Link relays are relays for when multiple controllers are connected in a network, as a "PLC
link" relay for shared use between controllers.
● If the operation result is output to a link relay (coil) on a PLC, it is sent to other PLC
connected in the network, and the operation result is reflected in link relays (contacts) with
the same number.
● You can send and receive bit information between PLCs in this manner when using link
relays.
2.5 Explanations about Relays
2-20 WUME-FP7CPUPGR-12
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