1746-NO4I/AB SLC 500 Analog Output Module

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Product reference      1746-NO4I

The Allen-Bradley 1746-NO4I is a SLC 500 Analog Output Module. This Analog Output Module has 4 Outputs and a Backplane Current (5 Volts) of 55 milliamps.

The Allen-Bradley 1746-NO4I is an SLC 500 4-channel analog output module using a 16-bit two’s complementary binary format. It has 4 current outputs that have an output range of -10-10V – 1 LSB, with all 4 outputs not individually isolated. It also has an output current range of 0 to 20 mA and a full scale of 21 mA. Backplane current draw of this module is 55 mA at 5V while it is 195 mA at 24V, and its over range capacity is 5% (0 to 21 mA – 1 LSB). Its power supply voltage rating is 24V DC +/- 10% at 195 mA maximum and the backplane isolation is 500V DC. Note that some applications require 21.6 to 26.4V DC when there is not enough power flowing from the SLC power supply. This 1746-NO4I also comes with an update response time of 512 µs for all the channels that are in parallel. The input step response of this module is 2.5 ms at 95%. Its operating temperature is 0-60 oC, its storage temperature is -40-85 oC, and its non-condensing ambient relative humidity is 5-95%.

 This factory-calibrated output module has an open enclosure and it is only compatible with the 1746 chassis. An LED status indicator is also present in this module. The 1746-NO4I has a load range of 0 to 500 Ω and maximum load reactance of 100 µH, with a converter resolution of 14 bit via the R-2R Ladder conversion method. The 1746-NO4I’s maximum overall accuracy drift is +/- 70 ppm/ oC of full scale.

Powerful, yet affordable - SLC 500 programmable controllers provide excellent value with extensive capabilities to address a broad range of applications including material handling, HVAC control, high speed assembly operations, small process control, simple motion control, and SCADA. Modularity - Modular processes, power supplies, I/O, memory options, and communication interfaces allow for a configurable and expandable system. Configure your system for the number of I/O, the amount of memory, and the communication networks needed. Later, you can expand the system by adding I/O, memory, or communication interfaces. Advanced instruction set - Includes indirect addressing, high level math capability, and a compute instruction. Communication network versatility - Choose from on-board Ethernet, DH+, or DH-485, as well as options for ControlNet, DeviceNet, or Remote I/O communications. Broad selection of I/O - Select from over 60 modules to control discrete, analog, and temperature signals. Third-party specialty modules are also available from Encompass partners to customize control solutions for your application needs. Industrially hardened product - Designed to withstand the vibrations, thermal extremes, and electrical noise associated with harsh industrial environments. Windows programming software - RSLogix 500 programming software maximizes productivity by simplifying program development and troubleshooting. 

SLC 500 System Overview The Allen-Bradley SLC 500 is a small chassis-based family of programmable controllers, discrete, analog, and specialty I/O, and peripheral devices. The SLC 500 family delivers power and flexibility with a wide range of communication configurations, features, and memory options. The RSLogix 500 ladder logic programming package provides flexible editors, point-and-click I/O configuration, and a powerful database editor, as well as diagnostic and troubleshooting tools to help you save project development time and maximize productivity. 

Local Systems At minimum, a modular hardware SLC 500 control system consists of a processor module and I/O modules in a single 1746 chassis with a power sup

With up to 64 K of configurable data/program memory available and over 60 types of I/O modules, as well as a choice of networking options, the SLC system provides a powerful solution for stand-alone or distributed industrial control.

Local Systems At minimum, a modular hardware SLC 500 control system consists of a processor module and I/O modules in a single 1746 chassis with a power supply

You can configure a system with one, two, or three local chassis, for a maximum total of 30 local I/O or communication modules. You connect multiple local chassis together with chassis interconnect cables to extend the backplane signal lines from one chassis to another.

Distributed Systems More complex systems can use: distributed I/O. multiple controllers joined across networks. I/O in multiple platforms that are distributed in many locations and connected over multiple I/O links.

Choose the processor module with the on-board communication ports you need. You optionally add modules to provide additional communication ports for the processor. For I/O in locations remote from the processor, you can choose between a ControlNet, DeviceNet, or Univeral I/O link. A communication interface module is required in both the local and remote chassis. Depending upon the communication ports available on your particular SLC control system, you can select operator interfaces that are compatible.

Laying Out the System Lay out the system by determining the amount of I/O necessary, the network configurations, and the placement of components in each location. Decide at this time whether each chassis will have it’s own controller or a networked solution. SLC 500 processors are available with a large range of memory sizes (1 K through 64 K) and can control up to 4096 input and 4096 output signals. All modular processors except the SLC 5/01 processor are capable of controlling remotely located I/O. By adding an I/O scanner module, you can use these processors to control/monitor these remotely located I/O across ControlNet, DeviceNet, and Universal Remote I/O links. SLC 500 processors are single-slot modules that you place into the left-most slot of a 1746 I/O chassis. For I/O in a location remote from the processor, the I/O adapter is a single-slot module that you place in the left-most slot of the I/O chassis. SLC 500 modular systems provide separate power supplies which must be mounted directly on the left end of the 1746 I/O chassis. The 1746 I/O chassis are designed for back-panel mounting and available in sizes of 4, 7, 10, or 13 module slots. The 1746 I/O modules are available in densities up to a maximum of 32 channels per module. Publication 1747-SG001D-EN-P — January 2009 6 Communications Evaluate what communications need to occur. Knowing your communications requirements will help you determine which processor and which communications devices your application might require. An SLC processor communicates across the 1746 backplane to 1746 I/O modules in the same chassis in which the processor resides. Various models of SLC processors have various on-board ports for communication with other processors or computers. Also, separate modules are available to provide additional communication ports for communication with other processors, computers, and remotely located I/O. Each processor has one or two built-in ports for either EtherNet/IP, DH+, DH-485, or RS-232 (DF1, ASCII, or DH-485 protocol) communication. In addition to the on-board ports available with SLC processors, you have the option of providing another communication port for an SLC processor by adding a communication module. Adapter modules for 1746 I/O are available for ControlNet and Universal Remote I/O links. An I/O adapter module in a chassis with I/O modules interfaces the I/O modules with the I/O link for communication with a scanner port for a processor at another location. 

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