Rockwell-automation 1770, D17706.5.16 Ref Mnl DF1 Protocol Command Instrukcja Użytkownika Strona 225

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13–10 PLC Addressing
Publication
17706.5.16 - October 1996
PLC5 Logical Addressing
PLC-5 processors, like PLC-3 processors, use a form of logical
addressing. With logical addressing, you specify the address for
each level (or sub-division) of PLC-5 memory, down to the smallest
subdivision you want to access:
With this processor You can specify up to
PLC5 4 levels of extended addressing, which is enough to address
any word in PLC5 memory.
PLC5/250 7 levels of extended addressing, which is enough to address
any word in PLC5/250 memory.
To send a command message to a PLC-5 node, you put the extended
address of the node in the field labelled PLC-5 SYSTEM ADDRESS
in the message block formats of your program. (See Chapter 7,
“Communication Commands.”) There are two types of PLC-5
logical addressing:
Logical Addressing
Type
Processors Description Page
logical binary
addressing
PLC5 A series of bytes used to encode up
to 4 levels of an address.
13-11
addressing
PLC5/250
A series of bytes used to encode up
to 7 levels of an address.
13-13
logical ASCII
addressing
PLC5 and
PLC5/250
Userspecified address in the same
form that you use at the programming
node.
This addressing lets any device
communicate with any other device,
without knowing the internal memory
structure of the target device.
13-15
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