Online simulating mitsubishi FX2n

jerrycat

Member
Join Date
May 2003
Posts
20
i have a problem simulating a melsec FX2N online.
i am using GX-developer fx. when i use the force function while the PLC is in run mode, i cannot monitor any change in the PLC output led, nor can i monitor any change in the batch monitoring of the device that was driven by the force fucntion. how can i simulate the PLC program online( when i simulate the program i want to see the output led changes, without connecting the PLC to the fysical proces)
 
Mitsubishi doesn't have true force function like some other PLCs.
When you "force" in Mitsubishi, you only set or clear or toggle
bit that you are trying to force.
However if you have rung that writes to the output and the rung
is scanned by program, it will alter the output state according
to condition of the rung.
This can be used when PLC is not running to test I/O for example.
If you need to really force output to one state or another,
and you want to maintain the state of the output while PLC is
running, you can try to write own logic:



FORCES_ENABLED FORCE_Y0 Y0_ON
---| |---------+---| |-----------------( )
| FORCE_Y0 Y0_OFF
+---|/|-----------------( )

AUTO ??? Y0_OFF Y0
---| |-------| |----+----|/|--+--------( )
| |
MANUAL ??? | |
---| |-------| |----+ |
|
Y0_ON |
---| |------------------------+





Be carefull when forcing inputs. They do stay on and there is
no way to check if and which input is forced. If you are not
sure and you don't want to check all inputs point by point,
try to restart PLC. This is supposed to clear input forces.
 
help on plc

when forcing is used a warning message appears explain the need for this.

thank you.
 

Similar Topics

hi you have help me out a lot, why not this time too. i,m using a mitsubishi melsec FX2n. i written a program that i have debugged completly using...
Replies
10
Views
4,927
Hi. I’m trying to upload program from existing PLC S7-1200. Create new project in TIA v15.1 then upload. After upload successfully, go online but...
Replies
5
Views
144
Does anyone know of a way to detect if someone is online with the controller in ControlLogix (from logic) I'm thinking that maybe there is a CIP...
Replies
7
Views
291
Got a VIPA 315-2AG23 that i try to go online with but can't seem to make it work through a network. I can go online if i'm plugged directly in the...
Replies
4
Views
230
I'm getting the Dreaded "Failed to go Online with the Controller, Unable to Open Connection - All Connections may be in use" I suspect an...
Replies
7
Views
439
Back
Top Bottom