Allen-Bradley 1747-ASB is a remote I/O adapter module that is part of the SLC 500 system. It establishes communication links between SLC or PLC scanners and various 1746 I/O modules via remote I/O. A remote I/O link consists of a master device (i.e., an SLC or PLC scanner) and one or more slave devices that act as adapters. The SLC or PLC map table gets the I/O module map directly from its chassis. For image mapping, it supports discrete transfer and block transfer. The 1747-ASB supports 1/2 slot, 1 slot, and 2 slot addressing for efficient image utilization. It is installed in a case with an SLC 500 processor and scans for I/O in the case.
The 1747-ASB module has 375 mA backplane current at 5V and 0 mA at 24V. It has a minimum and maximum heat dissipation of 1.875 W. It can transmit I/O data over distances of up to 3040 meters and supports 57.6K, 115.2K and 230.4K baud rates. It allows users to select image sizes up to 32 logical groups and control up to 30 chassis slots. The 1747-ASB also provides non-volatile memory and extended node capabilities for up to 32 adapters. When wiring, a cable of Belden 9463 or similar class must be used and no user programming is required. It uses a 6-pin Phoenix connector to connect remote I/O links and processors. The 1747-ASB module supports all SLC 501 I/O modules such as base module, resistance module, high speed counter module, etc. For troubleshooting and operation, it has three 7-segment displays with enhanced ability to display operational status and errors. The 1747-ASB is designed for use in industrial environments and provides noise resistance to the NEMA standard.
The 1747-ASB is a remote IO adapter for the SLC 500 automation platform. This IO adapter communicates with the I/O scanner module, interface card, and gateway to establish a remote IO connection.
For PLC applications, the main purpose of this module is to realize distributed IO applications through remote I/O networks. Compared to the SLC expansion bus, the expansion cable length is limited, and the SLC chassis expansion is very limited. With the 1747-ASB, up to 32 SLC cases with the 1747 RIO scanner can be used at a range of 762 meters or 2,500 feet (230.4 KBaud). 1524 meters or 5,000 feet (115.2 KBaud) and 3048 meters or 10,000 feet (57.6 KBaud). The adapter has up to 30 control capabilities, and this 30-slot limit can be segmented into different chassis or racks, each of which houses the RIO scanner and power supply.
In addition to communicating with the remote IO scanner, the module can also be used to communicate with the Allen-Bradley communication card installed directly into the personal computer. This enables remote programming and configuration capabilities and remote control via supervisory Control and Data Acquisition (SCADA). Alternatively, Allen-Bradley human machine interfaces (Hmis), such as PanelView products, are capable of adding remote I/O adapters that allow the HMI to control processes similar to SCADA systems.
This remote I/O adapter also supports communication with Allen-Bradley partner products as well as third-party gateways and converters to enable third-party communication with other automation products.
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