Description
Model 2426 is a versatile open-frame module that interfaces a variety of real world signals to a 10/100 Mbps Ethernet.
It has eight optically isolated digital inputs, sixteen digital outputs, six 12-bit analog inputs, one 12-bit analog output,
one RS-422/RS-485 serial communication port, and a high speed incremental encoder interface.
2426 Block Diagram
The module includes a number of features that simplify its installation and system integration:
- Its compact footprint allows it to fit into small spaces.
- Powered from a single 24VDC supply.
- DIN mounting feet expedite installation; the unit can be quickly and easily mounted by simply snapping it onto a standard DIN mounting rail.
- The unit communicates by means of standard embedded servers: Telnet for manual and automated control, and HTTP for configuration, manual control, and diagnostics.
- Precompiled API libraries are available for Linux and Windows, along with open source (C language) code for applications that require customization or porting.
Network Servers
Built-in HTTP and telnet servers enable any web browser or telnet client to access the module's I/O interfaces.
These standardized protocols make it possible to monitor and control I/O across a network without any special device drivers or proprietary software.
In the case of telnet, remote shell commands and replies are conveyed in plaintext, resulting in dramatically shorter development time and simplified maintenance.
|
2426 Control page screenshot
|
Control page viewed on an HTC Hero (Google Android) browser
|
The module supports concurrent telnet sessions so that multiple threads and hosts can communicate with it at the same time.
For example, maintenance personnel can plug into the network and monitor the module's operation over a private telnet session while, at the same time,
the module is controlled by a remote automation process running on a different session.
Furthermore, the automation process itself is not limited to a single telnet session; for example, it could have two threads—one to handle serial
port communications and another to control other I/O interfaces—with each thread running its own independent telnet session.
Consequently, system design is simplified and systems tend to be robust and easily maintained.
Safety Features
Model 2426 features several special mechanisms that can be used to enhance the safety of application systems:
- A hardware watchdog timer will reset the module in the event of a malfunction by the module's internal controller, thus forcing all outputs to their "safe" states.
- A communication watchdog timer constantly monitors network communications. If a network client fails to communicate with the module in a timely manner, the module will be automatically reset.
- Each digital output channel incorporates circuitry that will unconditionally deactivate the output driver if an associated contact (e.g., safety interlock or emergency stop switch) is open.
By implementing this essential function within the module, external termination boards can be eliminated and wiring simplified, with a commensurate reduction in system complexity and cost.
|
Digital output channel block diagram
|
Typical interlock application
|
Open Source SDK
A software development kit (SDK) is available for the 2426 that includes documentation, sample applications and a comprehensive application program interface (API).
The API transparently handles all underlying protocols so the programmer can focus on application development.
For example, an application program can simply call the API's s2426_WriteDout() function to update the module's general purpose digital outputs.
The SDK includes pre-built API libraries for Linux and Windows, along with open source API code (C language) with instructions for OEM customization and porting.
Accessories
Sensoray offers an optional termination board, Model 2426TA, which can be top-mounted to the 2426 module to add convenient field wiring terminal blocks without enlarging the module's footprint.
Model 2426TA breakout board
Specifications
| Communication Interfaces |
| Network |
Physical layer | 10BaseT, 100BaseTx Ethernet |
| Bit rate | 10/100 Mbps, auto-detecting |
| Isolation | 1500Vrms |
| Protocols | ARP, ICMP, IPv4, TCP, TELNET, HTTP |
| Configuration | Programmable via HTTP (static ARP): IP address, netmask, gateway |
| HTTP Server |
Concurrent sessions | 0 to 1 |
| Functions | Status, configuration, I/O monitor/control |
| TELNET Server |
Concurrent sessions | 0 to 3 |
| Time-out interval | 5 minutes (default, reprogrammable via HTTP), programmable per session via shell |
| Async Serial COM |
Physical layer | RS-422 or RS-485, shunt configurable |
| Bit rate | 300 bps to 115.2 Kbps, software selectable |
| Termination (RS-422/485) | 120 ohms ±5%, transmit and/or receive pair, enabled via shunts |
| Receiver turnaround | 250 µs maximum |
| Telnet protocol options | Com Port Control (RFC 2217), Binary Transmission (RFC 856) |
| Timestamp Generator |
Count rate | 1.0 MHz |
| Resolution | 32 bits, 1.0 µs |
| Analog Interfaces |
| Analog Inputs |
Channels | 6 external, 2 internal reference |
| Resolution | 12 bits |
| Input type | Differential |
| Differential input range | -10V to +10V, minimum (at 0V CMV) |
| CMV input range | -10V to +10V |
| Input impedance | 22M ohms minimum |
| Conversion rate | 1000 samples/s per channel |
| Inter-channel acquisition skew | 125 µs maximum |
| Trigger | Internal hardware timer |
| Data format | Signed 16-bit integer with timestamp |
| Analog Output |
Resolution | 12 bits |
| Output range | -10V to +10V, minimum |
| Settling time | 500 µs maximum (20V step change) |
| Data format | Signed 16-bit integer |
| Encoder Interface |
| Encoder Interface |
Resolution | 32 bits |
| Count rate | 0 to 30 MHz |
| Clock rate | 0 to 7.5 MHz |
| Clock/Index input signals | RS-422 differential, TTL/5VCMOS compatible, ±7V CMV maximum |
| Encoder power output | 5VDC ±5%, 100mA maximum |
| Data format | Signed 32-bit integer with timestamp |
| Digital Interfaces |
| Digital Inputs |
Channels | 8 |
| Input type | Differential pair, optically isolated with 4.7 Kohm series impedance |
| Input range | +5V to +24V |
| Digital Outputs |
Channels | 16 |
| Output type | Active low, open collector drive with inductive load EMF suppression diode |
| Output high-level voltage source | Internal, shunt selectable from continuous 24V or any interlock power source |
| Output current | 100 mA maximum per channel, 500 mA maximum total |
| Power and Environmental |
| Module Power |
Input power | 24VDC ±5% @120mA (digital outputs off, no external loads) |
| Interlock Power |
Channels | 5 |
| Voltage range | +5VDC to +24VDC, referenced to module input power |
| Current | 500mA maximum, per circuit |
| Temperature |
Operating range | -25 to 85°C |
| Mechanical |
| Module Dimensions |
Outer dimensions | 5.0H x 5.3W x 2.2D inches. W = DIN rail length. D = module height from DIN rail back panel; additional clearance required for field wiring. |
Mating Connectors
(*) = included with module |
Ethernet | RJ-45 plug, AMP 554169 or equivalent |
| Terminal block (*) | Pluggable TB, Phoenix Contact 17.92.83.8 or equivalent |
| Serial COM | DB-9 male, Norcomp 171-009-102-001 or equivalent |
| Encoder | DB-9 female, Norcomp 171-009-202-001 or equivalent |
| Analog I/O | DB-25 female, Norcomp 171-025-202-001 or equivalent |
| Digital inputs | DB-37 female, Norcomp 171-037-202-001 or equivalent |
| Digital outputs | DB-37 male, Norcomp 171-037-102-001 or equivalent |
Prices
| Model |
Description |
Qty 1 |
Qty 2-9 |
| 2426 | Ethernet Multi-Function Interface | $370 | $336 | | 2426TA | 2426TA | $call | $call |
|
