Ladder logic on Soft-Master Honeywell PLC ML50

HONEYWELL
(ML-50 PLC)
LADDER LOGIC PROGRAMMING ON SOFTMASTER
SHIVAM SINGH
+91-9971457422
shivamsingh0807@gmail.com
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CREATING NEW PROJECT IN SOFTMASTER
 Open SoftMaster and a window will open like shown below.
 Click on “Project” and select “New Project”. A window will open like shown below.
 Write the name of your project in “Project Name”.
 Select “ML-50” in PLC Series.

 Select “CPU type” as “MLM-XBMS” if you are working with a “modular PLC” and
Select “CPU type” as “MLM-XBCH” if you are working with “compact PLC”.
 Select “OK” and a window will open like shown below.
 This is the project window for ladder logic programming.
HOW TO USE NO, NC AND COIL
 First select a “NO”, place it at input side and you will get a window like shown below.
 Provide a “variable name” to it and then click “OK”. You will get a screen.

 Give it a physical address like “P0000”
 Now select a “Coil”, place it at output side, provide variable name and give physical
address “P0020”.
 Using above steps, let’s create a simple program using a “NO” and “Coil” that looks
something like shown below.
 To write a “comment” double click on the leftmost cell.
 To tell the softmaster where your programming is finished put “End Statement” at the
end of the program. For that click on “F10” that will open a window like shown below.
 Now type “END” at the instruction and then “OK”.

 Now move to “Tools” and select “Start Simulator” to check your program.
 We normally use “Simulator” when we are not working online i.e. with actual PLC and
want to check our program.
 Similarly we can use “NC” also, that works exactly opposite to “NO”.
HOW TO CREATE LOGIC GATES USING LADDER LOGIC
 Below shown are the logics for all the logic gates.

HOW TO CREATE PROGRAM FOR HOLDING & INTERLOCKING
 Below is the programming for holding & interlocking.
 Interlocking is also of two types: “Input Interlocking” if you are using an input for
interlocking and “Output Interlocking” if you are using an output for interlocking.
HOW TO USE MEMORY ADDRESSES IN PROGRAMMING
 We use memory addresses in our programming when number of physical addresses
available to us are less than we need for programming.
 Let’s create a program for “PUSH BUTTON AS TOGGLE SWITCH” i.e. when you
press the push button for first time, the output will “ON” and when press the same push
button again, the output will “OFF”. Since you have only 2 physical addresses, one for
input and other for output. So, here we use memory addresses to get desired output.
 The number of memory address available in ML-50 is 5000.

 In the above program we used output interlocking.
HOW TO USE TIMERS IN ML-50
 In ML-50, basically we have five timer: TON, TOFF, TMR, TMON, TRTG.
 “TON” is “on delay timer”, “TOFF” is “off delay timer”, “TMR” is “retentive timer”,
“TMON” is “monostable timer” and “TRTG” is “retriggerable timer”.
 To use a timer, click on “F10” that will open a window screen.
 Now move to the “category” section and select “timer/counter” and you’ll get the timers
in the “instruction list” section.
 Let’s create a program using a “TON” timer. Follow the steps as shown.
 Click on “F10” and select “TON” timer.

 Press “Enter” and “Give variable name to the timer” and then “OK”.
 Give timer adress “T0000”. And then “OK”

 Now give the timing value of timer and remember in ML-50 timer understands only in
“ms” and 10ms=1s and then click on “OK”.
 Note: There are 255 timers in ML-50.
 Your program will something look like as shown below:
 In same manner as shown above, one can create program for any timer.
 Remember one thing that while using “TON” timer one must provide holding to its input
so that it work properly.
 Now create program for using “TON” Timer as “TOFF”

HOW TO USE COUNTERS IN ML-50
 In ML-50, basically four counters are available CTU, CTD, CTUD and CTR.
 “CTU” is “up-counter”, “CTD” is “down-counter”, “CTUD” is “up-down counter” and
“CTR” is “reset counter”.
 To use a counter in your program follow the steps same as that of timer.
 Let’s create program using an up-counter i.e. “CTU” as shown below.
 For counters we use addressing as “C000”

 Your program will look something like shown below:
 In same manner one can use any counter.
HOW TO USE COMPARE BLOCKS
 To use compare blocks like less than, greater than, less than equal to, greater than equal
to etc. go to “F10” and follow steps as shown.
 As you can see in the instruction column type the sign for comparison like <=, >=, =, >, <
etc. follow by the address you want to compare like here is the address for timer “T000”
and then enter its value to compare.
 Let’s create program using compare blocks to make process continuous using single
timer.

HOW TO USE MOVE INSTRUCTION
 To use a “MOVE” function. Press “F10” and follow the steps as shown:
 Type “MOV” in the instruction column.

 Now give the address of the source data location and then destination where one wants to
move data.
 Your logic will be something like shown below:
HOW TO USE ARITHMETIC AND CONVERSION INSTRUCTIONS
 In ML-50, arithmetic instructions like ADD, SUB, DIV, MUL is used if you are working
with Integer and RADD, RSUB, RDIV and RMUL is used if you are working with real
integers.
 In ML-50, conversion instruction like “I2R” is used to convert integer to real and
similarly “ R2I” is used to convert real to integer.
 To use arithmetic instructions or conversion instructions, click on “F10” and follow the
instructions and follow as shown:

 Here “M000” and “M001” are the addresses of the data to be added and “M003” is the
address of the location where the added data is going to be saved. Your program will look
something like as shown below:
 Now, let’s create a program for scaling using arithmetic instructions and conversion
instructions. The formula for Scaling is
Y={(X-Xmin)(Ymax-Ymin)/(Xmax-Xmin)}+Ymin
Where Y is final output
X is value coming from field
Ymax and Ymin is values provided by the client
Xmax and Xmin is default values set through softmaster

HOW TO SET IO PARAMETERS BY SYSTEM ARCHITECTURE
 Click on “IO PARAMETER” option in the project window as shown:

 Now set the modules in I/O parameter setting as shown
 Click on the slot “0main” and Select PLC you are working with.
 Click on the slot 1 or slot 2 and select your DI or DO module accordingly.

 Click on the slot 3 or slot 4 and select your AI or AO module accordingly.
 Also select the communication module serial or ethernet if you are using it.
 Select AI Module and click on “DETAILS”. Set the parameters as shown.

 Now, select AO module and click on “DETAILS”. Set the parameters as shown
 Click “OK” and then “YES” to register global variables as shown below.
 Remember to set I/O parameters according to your system architecture.
HOW TO CREATE MANUAL LOGIC
.
 To create a manual logic always remember to use memory addresses “M0000” if you are
working with HMI and word addresses “D0000” if you are working with SCADA.
 Below is the program for manual logic for DI/DO.

 Manual logic for AI/AO with scaling.
 As in AI and AO, addresses are already assigned by the softmaster, we only need to
select them.

Ladder logic on Soft-Master Honeywell PLC ML50

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