Universal Serial Communications - Fuji Electric POD UG221H-LE4 User Manual

5.

Universal Serial Communications

• A general purpose computer or an ASCII unit of the PLC (master station) controls the Simple POD
(slave station) using dedicated commands.
General-purpose computer
disc
RESET
• The Simple POD internal user memory addresses ($u) must be used for memory allocation for
switch, lamp or data display parts.
When the master station specifies a screen number, data is written to the internal memory address
($u) allocated for the screen. If the screen is switched internally, the new screen number is read
and is written to the internal memory address ($u) allocated for the screen.
• For 1 : 1 connection, the Simple POD can send an interrupt to the master station through switch
activation, write command from the keypad, and screen change.
• Use CN1 of the Simple POD for connection with a general-purpose computer. Either signal level
RS-232C or RS-422 (RS-485) can be selected.
• In addition to 1 : 1 connection, 1 : n connection is available between the general-purpose
computer and the Simple POD via RS-422.
(A maximum of 32 Simple POD units can be connected.)
For 1 : n connection, interrupts cannot be used.
General-purpose computer
CN1
POWER
Simple POD No. 1
• For more information, refer to the User's Manual <PLC Connection> (FEH380).
Dedicated commands
Interrupt
RS-232C or RS-422 (RS-485)
RS-422 (RS-485) connection
CN1
SYSTEM SYSTEM
F1 F1
F2 F2
F3 F3
F4 F4
F5 F5
POWER
Simple POD No. 2
5. Universal Serial Communications
Read
Simple POD
Write
CN1
CN1
SYSTEM
F1
F2
F3
F4
F5
POWER
Simple POD No. 3
5-5
SYSTEM
F1
F2
F3
F4
F5
POWER
CN1
SYSTEM
F1
F2
F3
F4
F5
POWER
Simple POD No. "n" (n = 1 to 32)
5