Omron ZEN Quick Manual page 14

5 I/O Addressing
5. I/O Addressing
Area name Symbol
Input bits I
Expansion X
input bits
Button switch B
Analog A
comparator
Comparator P
bits
Output bits Q
Expansion Y
output bits
Work relays M
Holding relays H
[ Normal output
S Set
R Reset
A Alternative
OMRON ELECTRONICS, S.A.
The following tables show the I/O addressing, work areas, internal holding bits,
Timers, Counters and ZEN intelligent control screen bits.
I/O, Work and Internal Holding Bits
Bit N° bits
addresses
I0 to I5 6
X0 to Xb 12
B0 to B7 8
A0 to A3 4
P0 to Pf 16
Q0 to Q3 4
Y0 to Yf 16
M0 to Mf 16
H0 to Hf 16
Note
1 N.O. : Normally open N.C. : Normally closed
2 The following functions can be selected for output bits
Turns to ON or OFF according to the ON/OFF status of execution
condition
When the condition is ON, the output turns to ON
When the condition is OFF, the output turns to OFF
Alternates the output ON/OFFwhen the execution condition is in
ON
Function
Displays the ON/OFF status of the
input device connected to the CPU
input terminal
Displays the ON/OFF status of the
input device connected to the I/O
expansion unit input terminal
Displays the ON/OFF status of the
CPU operating switches (LCD-type
CPU)
Outputs the comparison result for
analog inputs. Only available for
models with a 24 Vcc power supply.
Compares the present value of
timers (T), holding timers (#) and
counters (C) and outputs the
comparison result.
Displays the ON/OFF status of the
output deivces connected to the
CPU unit
Displays the ON/OFF status of the
output deivces connected to the I/O
expansion unit
Can only be used with the ladder
program. Cannot output to an
external device.
The same as previous area but also
maintains its status even without
power supply on.
ZEN Programmable Logic Module
Ladder Program
N.O. / N.C inputs
(see note 1)
N.O. / N.C outputs
(see note 1.2)
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