Description

The DFM-400P Pulse Input Field Module provides specialized I/O to Delta’s BACnet™ controllers in the form of four pulsed inputs. It communicates directly on a RS-485 BACnet MS/TP network, where it functions as an independent BACnet device. The pulse input points are accessible to other BACnet devices over the BACnet MS/TP network.

Application

The DFM-400P is ideal for monitoring electrical, water, gas, and various flow meters or use in a diverse range of other applications that require pulse input monitoring. It is capable of handling pulses from 0 to 200 Hz on all four pulse inputs and 0 to 2000 Hz on two pulse inputs.

Additional strategies associated with the pulse counter values can be programmed through GCL+ in other controllers on the network.

Features

Native BACnet device

Pulse totals are backed-up in EEPROM during power outage

Key pulse count values are mapped to standard BACnet variables for multi-vendor integration

BACnet MS/TP network communication

Easy-to-mount housing

Derived Network Addressing (DNA) for simple integration into a standard network architecture

Incorporates Delta’s MS/TP autobaud feature which removes the need to manually set up the device’s baud rate

Specifications

Inputs

2 Pulse inputs (PI1 and PI2) @ 0 - 2000 Hz each

2 Pulse inputs (PI3 and PI4) @ 0 - 200 Hz each Monitors either dry contact or open

collector signals
Jumper selectable DEBOUNCE circuitry

for mechanical contacts (for pulses less

than 200 Hz)

Technology

8-bit Processor with internal A/D, Flash

and RAM
Software clock
LED status indication of the CPU Device Address

Set via DIP switch or software setup DIP switch address range: 1 to 99 per

BACnet MS/TP network segment Software switch address range: as per

the BACnet standard
Supports Delta’s derived network

addressing (DNA) scheme