ADAM-6251 Industrial Digital Input Module Features
Sixteen Digital Inputs For Comprehensive Equipment Monitoring
The ADAM-6251 provides 16 isolated digital input channels for monitoring machine states, sensor outputs, switches, alarms, safety contacts, and other field signals.Dry And Wet Contact Input Compatibility
Input operation is selected by switch for dry or wet contact signals. The module supports compatible sink NPN and source PNP field device configurations.Counter And Frequency Measurement Capability
Digital inputs support counter operation up to 3 kHz with 32 bit plus 1 bit overflow capability. The module also supports frequency input from 0.1 to 3 kHz for pulse based measurement applications.Configurable Counter Value Retention
Users can configure the module to retain or discard counter values after power loss, providing flexibility for equipment monitoring and production count applications.Daisy Chain Ethernet Connectivity
Dual Ethernet ports support daisy chain network installation to simplify distributed I/O wiring. Auto bypass protection helps preserve downstream network communication if a module loses power.Peer To Peer And Graphic Condition Logic Support
Peer To Peer communication supports direct data exchange with compatible modules, while Graphic Condition Logic enables user defined local logic rules. Peer To Peer and Graphic Condition Logic cannot operate at the same time.Industrial Protection And Status Indication
Sixteen digital input LEDs provide local channel status indication. The module also includes 2,500 VDC isolation protection, built in TVS and ESD protection, ±35 VDC overvoltage protection, and power reversal protection.
ADAM-6251 Digital Input Module Technical Specifications
ADAM-6251 Digital Input Module Technical Specifications
| Specification | ADAM-6251 Details |
|---|---|
| Product Type | 16 channel isolated digital input Modbus TCP module |
| Ethernet Interface | 2 port 10/100Base TX Ethernet for daisy chain connectivity |
| Digital Input Channels | 16 |
| Digital Output Channels | None |
| Digital Input Type | Dry contact or wet contact, selected by switch |
| Dry Contact Logic | Logic 0: open. Logic 1: closed to DGND |
| Wet Contact Logic | Logic 0: 0 to 3 VDC or 0 to minus 3 VDC. Logic 1: 10 to 30 VDC or minus 10 to minus 30 VDC |
| Supported Input Device Type | Sink NPN or source PNP |
| Input Impedance | 5.2 kΩ for wet contact |
| Input Transition Time | 0.2 ms |
| Counter Input | 3 kHz, 32 bit plus 1 bit overflow |
| Frequency Input Range | 0.1 to 3 kHz |
| Counter Value Retention | Keep or discard counter value when power is removed |
| Inverted Input Status | Supported |
| LED Indication | 16 digital input LEDs |
| Communication Protocols | Modbus TCP, TCP/IP, UDP, HTTP, DHCP, MQTT, SNMP |
| Local Control Functions | Peer To Peer and Graphic Condition Logic |
| Network Protection | Daisy chain connection with auto bypass protection |
| Isolation Protection | 2,500 VDC |
| Additional Protection | Built in TVS and ESD protection, power reversal protection, ±35 VDC overvoltage protection |
| Power Input | 10 to 30 VDC, 24 VDC standard |
| Power Consumption | 2.7 W at 24 VDC |
| Watchdog Timer | System watchdog at 1.6 seconds and programmable communication watchdog |
| Connector Type | Plug in 5 pin and 15 pin screw terminal blocks |
| Dimensions | 70 x 122 x 27 mm |
| Operating Temperature | Minus 10 to 70°C. B version: minus 40 to 70°C |
| Storage Temperature | Minus 20 to 80°C. B version: minus 40 to 80°C |
| Operating Humidity | 20 to 95% RH, non condensing |
| Storage Humidity | 0 to 95% RH, non condensing |
| Certifications | UL, CE, FCC |
ADAM-6251 Ethernet Digital Input Module Applications
The ADAM-6251 is suitable for industrial systems that require Ethernet connected monitoring of a high number of discrete field signals. Its 16 channel capacity, counter and frequency functionality, daisy chain Ethernet connectivity, and electrical isolation make it a strong choice for distributed equipment monitoring, signal acquisition, and remote I/O installations.
Suitable applications include:
Machine status and equipment condition monitoring
Sensor, push button, and limit switch monitoring
Production count and pulse monitoring applications
Conveyor and material handling equipment
Factory automation and assembly systems
Industrial alarm and annunciation systems
Packaging machinery monitoring
Building automation and facility status monitoring
Water and wastewater equipment monitoring
Energy equipment status monitoring
SCADA and Modbus TCP network integration
Distributed remote I/O installations