FX5 PLC loses impulses from encoder

plc.mitsubishi

Member
P
Join Date
Feb 2017
Location
Poland
Posts
8
Hello everyone!
I have strange problem.

I have plc, inverter (mitsubishi), incremental encoder (sick) and motor.
When i set the frequency on the inverter about 1,5Hz, the plc correctly counts impulses, but every higher frequency causes the plc counts impulses incorrectly or doesnt count.

All the parameters of high-speed counters and PLC program i am sure there are right ( i'm using only instruction to start high-speed counting (HIOEN) and to enable interrupt (EI).

Type of encoder - A/B phase, HTL.
PLC - FX5U
PLC program - Gx works 3.

Maybe somebody had similar problem? Maybe somebody could tell me where i need to look for the solve?

Thanks for help! :)
 
plc.mitsubishi said:
Hello everyone!
I have strange problem.

I have plc, inverter (mitsubishi), incremental encoder (sick) and motor.
When i set the frequency on the inverter about 1,5Hz, the plc correctly counts impulses, but every higher frequency causes the plc counts impulses incorrectly or doesnt count.

All the parameters of high-speed counters and PLC program i am sure there are right ( i'm using only instruction to start high-speed counting (HIOEN) and to enable interrupt (EI).

Type of encoder - A/B phase, HTL.
PLC - FX5U
PLC program - Gx works 3.

Maybe somebody had similar problem? Maybe somebody could tell me where i need to look for the solve?

Thanks for help! :)
Click to expand...

What's your time constant for input response time?
 
plc.mitsubishi said:
I set "No setting"
Click to expand...

Usually response time is 10ms, which means signal should be active for at least 10ms on X input before FX5 catches it.
I think no setting means response time is 10ms, not sure though, is that fast enough to catch pulses, usually hi speed inputs need <1ms time constants...
 
I set 10micro-s and nothing.

I forgot to write. Above described things are happening at the rotation of motor in the forward direction. With a rotation of the motor to the rear, high-speed counter doesn't count the impulses.

Tomorrow i will replace the encoder, and i'll write if it helped.

PS. Somebody told me that i need mount the resistor between connectors of encoder. Someone did something similar?
 

Similar Topics

M
Add FX5-2HC/ES Module in GX works 3 version 1.080j
PLC: Fx5u CPU As Per manual High Speed Input Module can add from Navigation window  [Parameter]  [Module Information]  Right-click  [Add New...
Replies
1
Views
98
goghie
G
C
FX5-40SSC-S
Good morning, I have had a machine stopped for some time, my servo works in manual mode, but it does not work in automatic mode. My equipment...
Replies
1
Views
78
goghie
G
C
Módulo Motion FX5-40SSC-S
Bom dia, Estou com uma máquina parada algum tempo, meu servo funciona em modo manual, porém não funciona em automático. Meu equipamento e...
Replies
0
Views
60
CapaceteJR
C
M
FX5 to Panelview 800 modbus TCP/IP
We have to connect a Mitsubishi FX5 PLC using Modbus TCP/IP to a Panelview Plus 800. We have communicate integers, bits and real numbers, but we...
Replies
1
Views
688
parky
P
V
Mitsubishi FX5 Strain Gauge Problems
Hello, I'm currently working on a project where I need to read values off my 0-3kg Strain Gauge and display them on my HMI display. I've...
Replies
9
Views
1,833
drbitboy
drbitboy
Back
Top Bottom