Samples for Siemens PLC LOGO! 8

Here are sample projects for Siemens PLC LOGO! 8 series.

Used hardware:

• Bought on Conrad.cz:

  • LOGO 12/24RCE from LOGO 12/24RCE Starter Kit

• Siemens pages for these products are:

  • Starter Kit - 6ED1057-3BA01-0AA8
    • https://mall.industry.siemens.com/mall/en/WW/Catalog/Product/6ED1057-3BA01-0AA8
  • LOGO! 12/24RCE - 6ED1052-1MD08-0BA0
    • https://mall.industry.siemens.com/mall/cs/cz/Catalog/Product/6ED1052-1MD08-0BA0

Used software:

• OS: XP SP3 in Virtual Box VM (use Network Interface that can access PLC via TCP/IP)
• LOGO!Soft Comfort version 8.2.1

Examples

Staircase timer - basic

Stairway light control using Push-button. Also uses Base Module (BM) display to show status.

Diagram:

Prototype (low-voltage bulb) photo:

File: StairCaseSwitch.lsc

Status: early prototype

Staircase timer - with potentiometer

Staircase timer where interval is set by Potentiometer (5KOHm - actually I used 4K7 in prototype, becasue I have no 5K in stock) - using Analog Input of LOGO 12/24RCE.

Most important component is "Analog Amplifier" where I set:

• Offset: 10 (was 0) - to have minimum timeout of 10 seconds (was 0)
• Gain: 0.3 (was 1.0) - to have maximum timeout 300+10 (310 seconds).

File: StairCaseSwitchWithPot.lsc

Status: early prototype

Diagram:

Prototype photo:

And schema (created in KiCAD):

Troubleshooting

"No program" error after Comfort programming

If you use improper target version in Comfort that PLC will refuse to start uploaded program with strange error "No program".

To explain: There are 3 options in my LOGO Comfort version 8.2.1:

• LOGO! 8.FS4 (name LOGO! 8.FS4_1)
• LOGO! 0BA8 (name Logo8_2)
• LOGO! 0BA7 (name Logo7_1)

So I change 8.FS4 to Logo8_2 which seems to work properly. Also when I look into PLC menu:

• Diagnostics -> Software -> FW Version: 1.82.02

PLC Logo refuses to start on power up

PLC Logo does not start, on pressing ESC it just prints "detecting..." and after a while fall to sleep again.

Cause: Too low power supply voltage (encountered with 9V Supply, which is of course out of specs)

Solution: Use proper 12V Supply.