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MELSEC-Q
10 DEVICES
10.2.7 Link relays (B)
(1) Definition
(a) A link relay is the High Performance model QCPU relay used to refresh the
High Performance model QCPU from the MELSECNET/H network
module's link relay (LB) and to refresh the MELSECNET/H network
module's link relay (LB) from the High Performance model QCPU data.
High Performance model QCPU
Link relay
B0
MELSECNET/H network module
Link relay
LB0
Link refresh setting range
Link refresh
Internal relays or latch relays can be used for data ranges not used by the
MELSECNET/H network system.
• Range where no link relay latch is performed...Internal relay
• Range where link relay latch is performed........Latch relay
(b) There are no restrictions on the number of contacts (N/O contacts, N/C
contacts) used in the program.
X0
B0
T0
Y20
X1
B0
B100
X2
B0
B1FFF
SET
B0
K20
No restrictions on the quantity used.
B0 switches ON at X0 OFF to ON.
The link relay (B0) ON can only be used for internal QCPU
processing, and cannot be output externally.
B0 ON/OFF information is output from the output module
to an external destination.
Figure 10.7 Link Relay
(2) Using link relays in the network system
In order to use link relays in the network system, a network parameter setting is
required. Link relays for which no network parameter setting has been
designated can be used as internal relays or latch relays.
REMARK
1) For details on the network parameters, refer to the For Q Corresponding
MELSECNET/H Network System Reference Manual.
2) The MELSECNET/H Network Module has 16384 link relay points assigned.
High Performance model QCPU has 8192 link relay points assigned. When using
subsequent points after Point 8192, change the number of link relay points at the
"Device" tab screen in the “(PLC) Parameter" dialog box.
Содержание QCPU (Q Mode)
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