The Allen-Bradley 1734-APB is a high-performance communication module designed for the Bulletin 1734 POINT I/O™ series. This adapter provides a seamless interface between the PROFIBUS DP network and the POINT I/O backplane. Its primary role is to manage data exchange, acting as a master unit on the local PointBus and a slave device on the fieldbus network. Consequently, this module allows a programmable logic controller (PLC) to control up to 63 POINT I/O modules through a single connection.
The 1734-APB module is powered by a nominal 24 Volts DC input, with a wide operational range of 10 to 28.8 Volts DC. It has a typical field side power draw of 400 milliamps. However, users must account for an inrush current of 6 amps for up to 10 milliseconds during startup. This adapter provides a <span style="color:red">POINTBus current of 1000 milliamps</span> at 5 Volts DC to supply logic power to the connected I/O modules. The module’s total power consumption is rated at 8 Watts, with a maximum power dissipation of 2.8 Watts at 28.8 Volts.
On the PointBus backplane, the 1734-APB operates as a master controller. It can communicate with and manage a total expansion of up to 63 POINT I/O modules, making it extremely scalable. Conversely, on the PROFIBUS DP network, it functions as a slave unit. This means it responds to commands from a PROFIBUS master, exchanging I/O data efficiently for real-time control applications.
This adapter is built for industrial environments. It features reverse polarity protection to safeguard against input overvoltage errors. In case of a power interruption, the output voltage remains stable within specifications for 10ms, provided the input is at 10V with a maximum load. Its compact design is specifically intended for DIN-rail mounting inside a control cabinet.
Mounting the 1734-APB is a straightforward process. First, install it at the leftmost side of a 1734 system to establish the backplane connection. Then, you can attach additional I/O modules directly to its right. The adapter converts the applied field power to PointBus 5 Volts power, which supplies logic power to the subsequent modules. For compliance with CE Low Voltage Directives, use a Safety Extra Low Voltage (SELV), NEC Class 2, or Protected Extra Low Voltage (PELV) power supply.
A key feature of this module is its field power distribution. It can power up to 14 I/O modules, assuming each draws approximately 75mA. Furthermore, it supports a maximum of 10 Amps of field power for the entire connected system. This capability helps simplify wiring and reduces the need for separate power supplies for small to medium-sized I/O racks.
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1 x Allen-Bradley 1734-APB PROFIBUS DP Network Adapter Module
1 x Removable terminal block (for field power connection)
1 x Installation Instructions sheet (publication 1734-IN024)
1. Can the 1734-APB be used as a PROFIBUS master?
No, it acts as a slave device on the PROFIBUS DP network. However, it operates as a master on its local POINT I/O backplane to manage the connected modules.
2. How many POINT I/O modules can connect to a single 1734-APB adapter?
It can handle a total expansion of up to 63 modules maximum, depending on the power budget and the specific current draw of each module.
3. What should I do if the output voltage drops when powering many modules?
The adapter provides a maximum PointBus current of 1000 milliamps. If the modules draw more than this, you may need to use a separate 1734-EP24DC power supply to distribute additional power.
4. What is the significance of the 10ms hold-up time?
This feature ensures that the output voltage stays within specifications for 10ms if the input drops out. This provides a brief window to prevent the system from resetting during minor power fluctuations.
5. Does the 1734-APB require configuration software?
Yes, you typically need a software tool like RSLogix 5000 or Studio 5000 (with a PROFIBUS master module) to configure the I/O mapping and communication parameters for the adapter.
| Brand Name | |
| Model No. | 1734-APB |
| Product Type | Network Adapter |
| hasMerchantReturnPolicy | Adjust according to reality |
| Shippingdetails | Adjust according to reality |
