Mitsubishi Electric MELSEC iQ-R Series, Programming Manual

Page: 883 / 2110

7 APPLICATION INSTRUCTIONS
7.13 Special Counter Instructions
881
7
Counting up or down the current value (2-phase input)
UDCNT2
This instruction updates the current value of the counter depending on the status of phases A and B pulses.
■
Execution condition
Setting data
■
Descriptions, ranges, and data types
*1 Only labels assigned to device (X) can be used.
*2 Only labels assigned to device (C) can be used.
■ Applicable devices
*1 Only X can be used. Note, however, that it can be used only within the range of the number of I/O points (the number of points that can
access I/O modules).
*2 Only C can be used.
Ladder ST
ENO:=UDCNT2(EN,s1,s2,d);
FBD/LD
Instruction Execution condition
UDCNT2
Operand Description Range Data type Data type (label)
(s1) (s1)+0: Count input number (phase A pulse)  Bit ANYBIT_ARRAY
*1
(Number of elements: 2)
(s1)+1: Count input number (phase B pulse)
(d) Number of the counter (device name) to be counted by the
UDCNT2 instruction

Device name ANY16
*2
(s2) Set value -32768 to 32767 16-bit signed binary ANY16
EN Execution condition  Bit BOOL
ENO Execution result  Bit BOOL
Operand Bit Word Double word Indirect
specification
Constant Others
X, Y, M, L,
SM, F, B, SB,
FX, FY J  \  T, ST, C, D, W,
SD, SW, FD, R,
ZR, RD U  \G  , J  \  ,
U3E  \(H)G 
Z LT, LST,
LC LZ K, H E $
(s1)

*1
          
(d)
  
*2
        
(s2)            
RnCPU RnENCPU
RnSFCPU RnSFCPU RnPCPU RnPCPU
(Standard) (Safety) (Redundant) (Process)
(s1) (d) (s2)
EN ENO
d s1
s2