Pulse counter PCM-8D with modbus

Импулсен брояч PCM-8D с modbus

PCM-8D are microcontroller pulse counters with modbus interface. Their purpose is to be wired to pulse devices to read remotely their values, or to make modbus network to read all meters in a building (usually water-, heat- and energy meters with pulse output). That is why they have own power supply. PCM-8D has two line x 16-digit LCD display, 4-button keyboard, and embedded real time clock. Up to four tariffs can be measured for every pulse input. Mounted on a standard М36 DIN-rail.

user manual

Main technical parameters of PCM-8D

number of pulse inputs up to 8
power supply 55-250 Vаc/ 80-350 Vdc
maximum consumption ‹ 2 W
display LCD, 2 lines, 16 symbols each
keyboard 4 membrane buttons
max frequency of pulses for each input 5/10/20/50/100 Hz
contact requirements non-potential, Ron < 1k, Roff > 1000k, up to 20m cable length (twisted pair)
work time without power supply backup battery LiMnO2 60mAh (~7 days)
storage temperature from -50° C to +90° C
work temperature from -10° C to +50° C
humidity from 40 to 90%
dimensions (H/W/D) 90/105/76 mm
interface RS-485 modbus
data transmission speed 300/1.2k/4.8k/9.6k/19.2k/38.4k bps
initial setup of serial interface 19.2kbps, even parity, 8 bit data, 1 stop
own weight 410 g

General information

PCM-8D is 8-input pulse counter, intended to connect tax instruments or other devices, which do not have any interface, but pulse outputs. One PCM-8D can connect maximum of 8 devices with pulse output. They are double powered - normally power supply is from the network, but if network failed for some reason, they switch to internal battery powered supply. This backup battery assures minimum 96h work time w/o external power supply. When network voltage is up again, the battery is recharged. to full capacity. Battery status is regularly displayed in volts, so user knows when he must replace the battery, if needed.

PCM-8D has embedded real time clock and calendar, which allows to track up to four time tariffs for each input. Collected pulses for each tariff, and total pulses for each input are saved in separate registers and are read through display or modbus network. Tariff defining can be done only via modbus interface, all other parameters can be set through device keyboard.

For client purposes PCM-8 have two-line, 16 symbol each line LCD display. The user can check in any moment collected pulses on each input or tariffs, cost of the pulses, medium measured (m3, кWh, etc.), battery status, device's address in modbus network, etc.

Devices of that kind can be connected to mutual modbus network and all set-up and reading can be centralized (controller with modbus, PC, etc).

Work modes