SMAR LC700 - Pulse Input Module - High Frequency - Ac

Modules And Accessories
3.61
M-304 - Pulse Input Module – High Frequency - AC
Part Number
M-304 (2 groups of 8 pulse inputs 0-10 KHz –AC).
Description
This module was designed for a direct connection to the AC generator sensors. It also has two
groups of 8 inputs to accumulate pulses until they can be read by the CPU module. After the CPU
reading, each individual counter will be cleared. The hardware is set to prevent the loss of any input
pulse during this acquisition process.
The ACC block was especially designed to work with the M-304 module accumulating input pulses
from an external source. Typically one of the module inputs is connected to the IN input of the ACC
block.
During the control cycle these modules accumulate pulses in a local register in their circuit. At the
end of every control cycle the CPU reads the total accumulated value and automatically clears the
internal register to the next cycle (avoiding capacity overload). When the logic control is executed,
the ACC block generates an integer number representing the number of pulses accumulated and
adds them to an internal accumulator TOT_L and TOT_H. This accumulator is shared as outputs of
the ACC block.
Values accumulated in TOT_L and TOT_H are moved to the registers MEM_L and MEM_H. The
contents of TOT_L and TOT_H are cleared. The M-304 module can read frequencies ranging from 0
to 10 KHz.
An internal filter cuts signals with frequencies from 20 KHz in order to eliminate high frequencies
noise.
All the inputs of a group have a not isolated common reference. In the case of non isolated sensors,
use isolation transformers.
PWR-A
PWR-B
GND-A
GND-B
304/67 - 2 Groups 8 high frequency pulse inputs - AC
1A
2A
3A
4A
5A
6A
7A
8A
9A
10A
1B
2B
3B
4B
5B
6B
7B
8B
9B
10B
M-304
PWR-A
1
2
3
4
5
6
7
PWR-B
0
1
2
3
4
5
6
7
smar
0
smar
Figure 3.36- – Pulse Input Module M-304