Omron NT20, User Manual

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Lamps, Touch Switches, Numeral Setting Section 5-3
• PLC Ladder Program
No PLC ladder program is required to control the NT20. Only a program to
control the robot arm movements is required.
• NT20 Operation
When the ladder program to control the robot arm is executed, the lamps
on the NT20 screen turn ON and OFF in synchronization with the robot
arm movement.
For example, lamp #0 lights when the robot arm moves up and goes out
when it stops moving up.
5-3-3 Allocated Bits and Display of Touch Switches
Method for PLC Notification and NT20 Control
Two types of bit can be allocated to touch switches: notify bits - which serve to
notify status to the PLC - and control bits, lamp bit, which control the lighting
(flashing) of the touch switches. (For other types of function, only lamp bits
can be allocated.) When a touch switch is pressed the notify bit status
changes and, when the lamp bit is ON, the touch switch lights (or flashes).
In order to notify the PLC of the status of a touch switch, the touch switch
must be allocated to a specified PLC bit so that it can be managed. Designate
the area and bit number.
To use touch switches for notification to the PLC, the following settings must
be made using the Support Tool: “touch switch” – “bit setting” – “notify bit”.
• Types of Notification Operation
When using Ver. 5 of the direct connection function, the notification opera-
tion when the touch switch is pressed can be selected from the following
four types (with Ver. 4 direct connection, the type is fixed as “momentary”):
• Momentary
When the touch switch is pressed the bit comes ON; when it is re-
leased the bit goes OFF.
• Alternate
Line 1 Process 3
Conveyor Loading Robot Arm
Raise: Lamp#0
Lower: Lamp#1
Counterclockwise: Lamp#2
Clockwise: Lamp#3
Clamp: Lamp#4
Unclamp: Lamp#5
C/
CLOCK
CLOCK
DOWN
UP
CLAMP
UNCLAMP
START
Press
bit
Notification
Lights
Control
NT20 PLC
abcde
1
1
←1