KEYENCE Visual KV Series - Manual (Page 105)

2.4 Instruction Details
1
2
3-81 Chapter 2 Instructions
Application of KEEP instruction
■ Detection of chewing gum packs
Detects chewing gum packs over the carton using the proximity switch ES series
(0001 to 0003). If the switch detects that one or more packs of chewing gum are
missing, output relay 0500 turns ON for 1 s.
The timing clock is generated from the visible beam photoelectric switch PZ2 (0000).
• Executes SET when all input relays 0000 to 0003 are ON.
• Detects presence/absence of chewing gum packs at DOWN edge of 0000.
• Outputs 1-s one-shot pulse from output relay 0500 when 1000 is OFF.
Coding
Timing diagram
Reflector R-2
ES
PZ2-61
ES
ON
Gum
Gum
Gum
Gum
Gum
Gum
Gum
Gum
OFF ON
0000
1001
0000 1001
DIFD
#00010
T001
1001 1000 T001
0500
0001 0002 0003
KEEP
SET
1000
RES RES
0500
Line No. Instruction Operand Line No. Instruction Operand
0000 LD 0000 0007 DIFD 1001
0001 AND 0001 0008 LD 1001
0002 AND 0002 0009 ANB 1000
0003 AND 0003 0010 OR 0500
0004 LD 1001 0011 ANB T001
0005 KEEP 1000 0012 OUT 0500
0006 LD 0000 0013 TMR 001 #00010
0000
0001
0002
0003
0500
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
ON ON
Executes SET when all input relays
0000 to 0003 are ON.
Detects presence/absence of chewing
gum packs all Down edge of 0000.
Outputs 1-s one-shot plus from output
relay 0500 when 1000 is OFF.
1 s
KEEP
KVNKA Chap 02_4aP.p65 08.3.11, 11:58 AM 81