I/O instructions
FUN 77 0 FUN 77 0
HEX-KEY INPUT
HKEY HKEY
IN : Starting of digital input for key scan
OT: Starting of digital output for multiplexing
key scan (4 points)
D : Register to store key-in numbers
KL : Starting relay for key status
WR: Working register, it can't repeat in use
D may combine with V0Ś0P0~P9 to serve
indirect addressing application
X Y M S WY WM WS TMR CTR HR OR SR ROR DR XR
Range
X0 Y0 M0 S0 WY0 WM0 WS0 T0 C0 R0 R3904 R3968 R5000 D0
V0Z
#" #" #" #" #" #" #" #" #" #" #" #" #" #"
Ope-
P0~P9
rand X240 Y240 M1896 S984 WY240 WM1896 WS984 T255 C255 R3839 R3967 R4167 R8071 D4095
IN %
OT %
D % % % % % % % %* %* % %
KL % % %
WR % %* %
The numeric (0~9) key function of this instruction is similar as for the TKEY instruction. The hardware
connection for TKEY and HKEY is different. For TKEY instruction each key have one input point to connect,
while HKEY use 4 input points and 4 output points to form a 4x4 multiplex 16 key input. 44 means that
there can be 16 input keys, so in addition to the 10 numeric keys, the other 6 keys can be used as function
keys (just like the usual discrete input). The actions of the numeric keys and the function keys are
independent and have no effect on each other.
When execution control "EN" = 1, this instruction will scan the numeric keys and function keys in the matrix
formed by the 4 input points starting from IN and the 4 output points starting from OT. For the function of the
numeric keys and "NKP" output please refer to the TKEY instruction. The function keys maintain the key-in
status of the A~F keys in the last 6 relays specified by KL (the first 10 store the key-in status of the numeric
keys). If any one of the A~F keys is depressed, FKP (FO1) will set to 1. The OT output points for this
instruction must be transistor outputs.
The biggest number for a 16-bit operand is 4 digits (9999), and for 32-bit operand is 8 digits (99999999).
However, there are only 6 function keys (A~F), no matter whether it is a 16-bit or 32-bit operand.
ŁThe instruction in the diagram above uses
X0~X3 and Y0~Y3 to form a multiplex key
input. It can input numeric values of 8 digits
and stores the results in R1R0. The input
status of the function keys is stored in
M10(A)~M15(F).
9-53
I/O instructions
FUN 78 0 FUN 78 0
DIGITAL SWITCH INPUT
DSW DSW
IN : Starting of input for thumb wheel switch
OT : Starting of output for multiplexing scan
(4 points)
D : Register to store readout value
WR: Working register, it can't repeat in use
(WR & WR+1 for 16-bit operation;
WR, WR+1 & WR+2 for 32-bit operation)
D may combine with V0Ś0P0~P9 to serve
indirect addressing application
X Y WY WM WS TMR CTR HR OR SR ROR DR XR
Range
X0 Y0 WY0 WM0 WS0 T0 C0 R0 R3904 R3968 R5000 D0
V0Z
#" #" #" #" #" #" #" #" #" #" #" #"
Ope-
P0~P9
rand X240 Y240 WY240 WM1896 WS984 T255 C255 R3839 R3967 R4167 R8071 D4095
IN %
OT %
D % % % % % % % %* %* % %
WR % %* %
When input control "EN" = 1, this instruction will readout one digit data from the 4 input points starting from
IN (IN0~IN3). It takes 4 scans to read out a group of 4-digit BCD values (0000~9999) and store them into D
register. With a 32-bit operand, each scan can get 2 digits of data by reading the additional digit from
IN4-IN7 and store it in the D+1 register. Each bit of OT0~OT3 will sequentially set to 1 and get the digit data
respectively into 100(ones), 101(tens), 102(hundreds), and 103(thousands). As long as EN is 1, PLC will
scan and read out in continuous cycles. When each complete cycle is finished (i.e. the 4 digit readout of
100~103 is completed), the readout completed flag "DN" is set to 1. However, it is only kept for one scan. If
any digital readout value is not within the range of 0~9 (BCD), then reading error "ERR" will be set to 1 and
the value of that group of digits will be set to 0000.
The output points must be transistor outputs.
ŁIn this example, when X10 is 1, then the numeric value of the
thumb wheel switch (5678 in this example) will be read out
and stored into the R0 register.
ŁThe bits (8,4,2,1) with same digit should be connect together
and series with a diode (as shown in diagram below).
ŁWith 32-bit operand a set of similar thumb wheel switch may
be added to X4~X7 (Y0~Y3 are shared with another group).
9-54
I/O instructions
FUN 79 0 FUN 79 0
7-SEGMENT OUTPUT WITH LATCH
7SGDL 7SGDL
S : Register storing the data (BCD) to be
displayed
OT : Starting number of scanning output
N : Specify signal output and polarity of latch
WR : Working register, it can't repeat in use
S may combine with V0Ś0P0~P9 to serve
indirect addressing application
Y WX WY WM WS TMR CTR HR IR OR SR ROR DR K XR
Range
Y0 WX0 WY0 WM0 WS0 T0 C0 R0 R3840 R3904 R3968 R5000 D0
16-bit V0Z
#" #" #" #" #" #" #" #" #" #" #" #" #"
Ope-
number
P0~P9
Y240 WX240 WY240 WM1896 WS984 T255 C255 R3839 R3903 R3967 R4167 R8071 D4095
rand
S % % % % % % % % % % % % %
OT %
N 0 03
WR % %* %
When input control "EN" = 1, the 4 nibbles of the S register, from digit 0 to digit 3, are sequentially sent out to
the 4 output points, OT0~OT3. While output the digit data, the latch signal of that digit (OT4 corresponds to
digit 0, OT5 corresponds to digit 1, etc...) at the same time is also sent out so that the digital value will be
loaded and latched into the 7-segment display respectively.
When in D (32-bit) instruction, nibbles 0~3 from the S register, and nibbles 0~3 from the S+1 register are
transferred separately to OT0~OT3 and OT8~OT11. Because they are transferred at the same time, they can
use the same latch signal. 16-bit instructions do not use OT8~OT11.
As long as "EN" remains 1, PLC will execute the transfer cyclically. After each transfer of a complete group of
numerical values (nibbles 0~3 or 0~7), the output completed flag "DN" will set to 1. However, it will only be
kept for 1 scan.
In this example, when X0=1, the 4 nibbles of R0
will be transferred to the first group 7-segment
display in the diagram below. The 4 nibbles of R1
will be transferred to the second group 7-segment
display.
9-55
I/O instructions
FUN 79 0 FUN 79 0
7-SEGMENT OUTPUT WITH LATCH
7SGDL 7SGDL
PLC's transistor output has both a negative logic transistor output (NPN transistor - when the output
FATEK
status is ON, the terminal voltage of the transistor output is low), and a positive logic transistor output (PNP -
when the output status is ON, the terminal voltage of the transistor output is high). Their structure is as follows:
FBS-PLC negative logic output (NPN transistor) FBS-PLC positive logic output (PNP transistor)
4
When Yn is When Yn is "ON",
"ON", this output Yn's terminal
voltage is low voltage is high
The data inputs (8,4,2,1) and latch signals of the 7-segment displays on the shelf for positive and negative logic
are all available. For example, for numerical value "8", the positive logic input should be 1000, and the negative
logic input 0111. Similarly, when the latch signal is 0, the positive logic latch permits the display numerical
values to enter through the latch (i.e. be loaded). When the latch signal is 1, the numerical values in the latch
are latched (maintained), and with negative logic they are not. The following diagram of a CD-4511 7-segment
display IC is an example of a positive logic numerical value input with latch.
BCD to
l 7-segment
Latch sing1
Because the PLC output and the 7-segment display input polarity can be positive and negative logic. Therefore,
the polarities between output and input must be coordinated to get the correct result. This instruction uses N to
specify the polarity relation between the PLC transistor output, and the 7-segment display. The table below
shows all the possibility.
Numerical value input (8~1) Latch signal (100-103) Value of N
Same 0
Same
Different 1
Same 2
Different
Different 3
In the diagram above, CD4511 is used as an example. If use NPN output, the data input polarity is different to
PLC, and its latch input polarity is the same as PLC, so N value should chosen as 2.
9-56
Numberical value input
I/O instructions
FUN 80 FUN 80
MULTIPLEX INPUT
MUXI MUXI
IN : Starting of multiplexing input
OT: Starting of output for multiplexing
scan (must be transistor output)
N : Multiplex input lines (2~8)
D : Register for storing inputs
WR: Working register, it can't repeat in use
D may combine with V0Ś0P0~P9 to serve
indirect addressing application
X Y WY WM WS TMR CTR HR OR SR ROR DR K XR
Range
X0 Y0 WY0 WM0 WS0 T0 C0 R0 R3904 R3968 R5000 D0 2
V0Z
#" #" #" #" #" #" #" #" #" #" #" #" #"
Ope-
P0~P9
X240 Y240 WY240 WM1896 WS984 T255 C255 R3839 R3967 R4167 R8071 D4095 8
rand
IN %
OT %
N %
D % % % % % % % %* %* % %
WR % %* %
This instruction uses the multiplex method to read out N lines of input status from 8 consecutive input points
(IN0~IN7) starting from the input point specified by IN. With this method we can obtain 8N input status, but
only need to use 8 input points and N output points.
The multiplex scanning method goes through N output points starting from the OT output point. Each scan one
of the N bits will set to 1 and the corresponding line will be selected. OT0 responsible for first line, while OT1
responsible for second line, etc. Until it read all the N lines the 8N status that has been read out is then
stored into the register starting at D, and the execution completed flag "DN" is set as 1 (but is only kept for
one scanning period).
With every scan, this instruction retrieves a line for 8 input status, so N lines require N scan cycles before they
can be completed.
This example retrieves 4 lines 8 points of
input, 32 point status in all. They are stored into
the 32-bit register of DWM0 (M0~M31).
9-57
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