Scan List - Omron WT30 Operation Manual

Scan List

3-1

Scan List

• Communications with Unregistered
Communications Partner
(Scan List Disabled Mode)
Add or replace WT30 Terminals easily
WT30
I/O Slave Station
Node No. 2
36
Communications are divided into two types depending on whether the com-
munications partner (I/O Slave Station) is registered or unregistered. Regis-
tration of communications partners is referred to as scan list registration. The
mode for communications with specified, registered communications partners
is referred to as scan list enabled mode. The mode for communications
between the Serial Master Station and unregistered I/O Slave Stations from
the specified node number 1 up to the specified number of nodes is referred
to as scan list disabled mode.
For details, refer to 3-6-1 Scan List Registration on page 50.
PLC
WT30 Serial Master Station
Not registered
WT30
I/O Slave Station
Node No. 1
Unregistered Slaves
Mistaken recognition will occur if an I/O
Slave Station set with the same node
number or frequency channel is present
in the radio signal range.
Immediate operation is possible by simply
setting the frequency channel and node
number for the I/O Slave Station after it is
added or replaced. This usage is sup-
ported provided that the same frequency
channel is not already being used nearby,
and that the operation on a different fre-
quency channel can be confirmed.
For details on using unregistered slave stations, refer to 3-4 Using Unregis-
tered Communications Partners and for using registered slave stations, refer
to 3-5 Registering the Communications Partner.
• Communications with Registered
Communications Partner
(Scan List Enabled Mode)
PLC
No. 1
WT30 Serial Master Station
EEPROM
Registered
WT30 WT30
I/O Slave Station I/O Slave Station
Node No. 2 Node No. 1
Registered Slaves
Communications are performed with reg-
istered I/O Slave Stations only. Therefore,
mistaken recognition will not occur. Com-
munications are also only performed with
the specified I/O Slave Stations, thereby
eliminating unnecessary polling and
heightening security.
By registering the I/O Slave Station with
the serial number check enabled, re-reg-
istration at the Serial Master Station is
required when an I/O Slave Station is
replaced.
Section 3-1