Pulse Counter

[JohnnyB]

Hi Mr and Mrs.

I have several reed switch (dry contact, normally open), connected in modules DI-IO16. In PLC have a function for counting the pulses. When reed switch is OFF the bit is 0, if ON the bit is 1, but, i need use some reed´s connected in a other digital board (way RS485 to communicate to PLC). The digital board work unlike the module DI-IO16. When reed is OFF the bit is 1, when ON the bit is 0.

For i counting the pulses is necessary use funcion negative transition contact (fall) or make a other function ?

Nice day for all

[Stein Yair]

Hi,

Can you use a different counter for the second board and then add the two counters?

[JohnnyB]

Hi,

Can you use a different counter for the second board and then add the two counters?

Mr Stein Yair

I talk with a saler off board, and they reply that is possible , upgranding a firmware change the bit if reed is off to O and if ON to 1.

Who i use modbus inputs in ladder funcion, because with a IO-DI16 i select "positive transition contact (rise).

For counter pulse using IO-DI16 i use only function "INC" and read in data table the MI relative to respective input.

Each input of the modbus module use only MI ? - For project that i talk i use Vision 1040 with 38 modules modbus (16 input per module).

[Stein Yair]

It is not clear to me what the difference between the two counters is, and what exactly the problem is.

Please explain it in detail.

Describe what you are doing step by step.