FX-4DA - No current or voltage coming out

[Tjkeets90]

Hi all,

I am trying to program an FX-4DA but I am struggling to get anything out of the channels.

The 24v supply is okay.

I have attached a screenshot of my code.

The module number is 1. There is an FX-4DA before it which is working fine.
Its on an FX3U.

Thanks in advance.

 

[parky]

It is common to set the channel type only on first scan i.e.
LD M8002 [MOV Hxxxx G1/G0]
Then to use a slight delay timer before sending the data to the channels
i.e.
LD M8000 OUT T0 K5
LD T5 [BMOV DXXXX U1/G1 K4]
This is to allow the module to initialise before sending data.

You can also use the FROM/TO instructions i.e.
LD M8002 [TO K1 K0 Hxxxx K1]
LD M8000 OUT T0 K5
LD T5 [TO K1 K1 Dxxx K1] i.e. Card 1, BFM #1, Data, Number of channels

Channels settings
0 Voltage output mode -10 V to +10 V -32000 to +32000
1 Voltage output
analog value mV specification mode -10 V to +10 V -10000 to +10000
2 Current output mode 0 mA to 20 mA 0 to 32000
3 Current output mode 4 mA to 20 mA 0 to 32000
4 Current output
analog value μA specification mode 0 mA to 20 mA 0 to 20000
F Channel not use

 

[Tjkeets90]

Hi Parky,

Thanks for that! You've saved me a few times on this site!

I am getting voltage out now but my range is 0-2000, yet on an FX-2DA I have on another FX3U PLC it is 0-4000.
Is there a way I can change this?
The 4DA I am using was originally on an FX1 (just changed it to an FX3U), whereas the 2DA is brand new.
Do these cards hold any sort of memory where you can specify range do you know?

Thanks,

 

[parky]

It depends on a number of things i.e. if it's an ADP or other plus the type of output
see this manual it explains most of the card types.
https://dl.mitsubishielectric.com/d....pdf?msclkid=fba711fdcec211ec81409e406a49820a

There are hundreds of buffer memory addresses that may affect the resolution, type of compensation & error reporting etc. I suggest you check the manual.
I seem to remember the values being 2000 as well but according to the manuals it can be 32000.
A/D I remember were 0-4000 & D/A were 2000 but it is possible some of the later versions with different firmware may have changed that, I'm retired now so do not have access to any of those cards, TBH I have never used the adapter cards for left hand side of PLC only the standard Analog modules.

 

[parky]

Ah... I seem to remember there are differences between FX1/2 analogues & the newer FX3, originally when the FX3 came out (completely compatible with FX1/2, there were no FX3 extension modules so it used the FX2 type, If yours is the older module then it would have 0-2000 for AO & 0-4000 for AI, there were also differences on the AD modules the FX2N type the analogue values were in buffer memories 10-13 (I think) whereas on the FX3 this moved to 11-14 or something like that, a colleague of mine rang me up he was having problems with an analogue input module, It turned out after reading the differences between the FX2 & 3 modules the buffer memories had changed, it sounds like the other system is using the FX3 & the module you have is actually an FX2 module, even if it states it is an FX3U-4DA it could actually be an FX2, It is possible that the early hardware was based on the FX2 firmware or that it is a clone, seen clones (and there are many) that are sold as FX3 but are actually based on the FX2.

 

[goghie]

With FX2-4DA and voltage selected output, it is -10V to +10V, and -2000 to +2000. Maybe there is offset or some scaling.

 

[parky]

The FX3U-4DA can be changed, however, i'm pretty sure these cannot be changed on the FX2n-4DA version so you are stuck with 2000 as the max value.