Identifying SLC 500™ System Components

SLC 500 System Options  The SLC 500 line of processors comprises both fixed and modular processor styles.:

Fixed Hardware  Fixed SLC 500 processors have a built-in power supply with I/O modules in one unit. The following options are available with the fixed-hardware processor:  20, 30, or 40 digital I/O points  Two-slot expansion chassis  The following graphic shows a fixed SLC 500 processor with 20 I/O points and a two-slot expansion chassis

Modular Hardware  The following options are available with the modular-hardware processor:  Seven power supply types  Up to 4096 inputs and 4096 outputs  Five processor types  The following graphic shows a modular SLC 5/04 ™ processor:

Modular SLC 500 System Components  The modular SLC 500 system components include a power supply, processor, chassis, and I/O modules.

Power Supply  Power Supply: A component that provides system power requirements for the processor and I/O modules.  Seven power supplies, three AC-input power supplies and four DC-input power supplies, are available:

Power Supply Nominal Input Voltage Backplane Output Current 1746-P1 120V or 220V AC 2A at 5V DC 1746-P2 120V or 220V AC 5A at 5V DC 1746-P3 24V DC 3.6A at 5V DC 1746-P4 120V or 220V DC 10A at 5V DC 1746-P5 125V DC 5A at 5V DC 1746-P6 48V DC 5A at 5V DC 1746-P7 12V DC 24V DC 2A at 5V DC 3.6A at 5V DC

Power supply  All power supplies have a light- emitting diode (LED) that indicates proper power supply. Power supplies are designed to withstand brief power losses (between 20 ms and 3 s) without affecting the operation of the system.

Power supply

Processor  Processor: A component that acts as the brain of the system, receiving information from input devices via the I/O system, making decisions based on that information, and then sending information to the output devices via the I/O system.  SLC 500 processors offer a wide range of choices in memory, I/O capacity, instruction set, and communications ports. The following table lists characteristics of the modular processors:

Processor Type I/O Instruction Memory SLC 5/ total 1K or 4K SLC 5/ /40964K SLC 5/ /4096 8K or 16K SLC 5/ / K,32K, or 64K words SLC 5/ / K,32K, or 64K words

CPU The following features are specific for each processor type:  Memory capacity  Complexity of available instruction set  Communications options  Time required to execute the control program

CPU Run Position: Execute the program and energizes the outputs. No editing is allowed. Can not change the CPU mode using pc or programming device. PROG Position: Program is not running and all output are de-energizes. Editing is allowed. Can not change the CPU mode using pc or programming device. REM mode: Can change the CPU mode from Run to Prog. Mode using PC or programming device.

Chassis  Chassis: A hardware assembly that houses the processor and I/O modules. SLC modular chassis provide the following functions:  Power distribution  Containment of I/O modules  Communication path between I/O modules and processor  SLC modular chassis are available in four sizes:  4-slot  7-slot  10-slot  13-slot :

Chassis  A chassis requires a power supply (which connects to the chassis without a separate cable) to provide power to the processor and each I/O slot. Additionally, chassis can be connected together to increase the I/O available to a processor, as shown in the following graphic:

Chassis

I/O Modules  I/O Modules: Electronic plug-in units used to interface with the input and output devices in the machine or process being controlled. Input modules receive data from input devices and send it to the processor. Output modules receive data from the processor and send it to output devices.

I/O Module Function Examples of devices that connect to module Digital/discrete Sends& receives on/off signals Pushbuttons, indicators, photo eyes, starters Analog Sends& receives variable input/output signals Temperature, voltage, speed current devices Process Provides process control Temperature, weighing devices Servo positioning Provides positioning control Hydraulic rams, encoders Specialized Provides specific functions Flowmeters, clutch/brake systems

I/O Module

EEPROM Memory Module:  A module that can be inserted into a SLC 500 processor to maintain a copy of the project in case the processor experiences either of these situations:  Memory corruption  Extended power loss  Memory module information can be found under the Mem Module tab of the processor status file, as shown in the following graphic:

Signal Flow through an SLC 500 System:  The following graphic outlines the sequences of events from the activation of machine or process inputs to the energizing of machine or process output devices:

Communication  The following terms are associated with network communications:  Network: A series of stations (nodes) physically connected together.  Node: A device on a network capable of sending or receiving information.  Link: The path or physical means established for transmitting data between two or more locations.  Baud: A unit of signaling speed, across a communications link, equal to the number of signal events per second (bits per second).

Network Topologies  Daisy-Chain –Each device has two sections of cable tied together –Each end has termination (resistor/capacitor)  Examples  DH+  DH-485  Remote I/O SLC

Network Topologies  Star –All devices physically connected at one point  Example  Ethernet PLC

Networks - How to Decide on One? n Maximum number of devices –How many nodes are required for the application? –How many nodes should be reserved for future expansion? n Maximum network length –Usually specified as the physical cable distance from the first node to the last node on the network –Drop length is the length of cable from the main cable to the node n Device supported –Programmable controllers –Programming devices –Operator Interfaces –Other Computers - PCs, Workstations, Minis, Mainframes...

A-B Communication Network Terms RS-232 RS-485 DH-485 REMOTE I/O DF1 DH+ RS-422 } } Electrical Connections

Example: DH+ Network Channel 1 of an SLC 5/04 processor is used to connect to a DH+ network. An example of SLC 500™ processors on a DH+ network is shown in the following graphic:

Data Highway Plus (DH+) Network:  A Data Highway Plus ™ (DH+) is a local area network designed to support remote programming for factory floor applications. A DH+ network has the following characteristics:  Uses baud rates up to kbit/s  Allows a maximum of 64 (0-77 octal) nodes  Allows a maximum network length of 3,048 m (10,000 ft) at 57.6 kbit/s  Communications speed is influenced by distance within the DH+ network.

Example: DH 485 Network Channel 1 of SLC 5/01, SLC 5/02, and SLC 5/03 processors is used to connect to the DH 485 Network. An example of SLC 500 ™ processors on a DH 485 network is shown in the following graphic

DH 485 Network:  A DH 485 network is a local area network designed for plant floor applications. DH 485 connections enable you to go online to any processor on a DH 485 network from one connection point. A DH 485 network has the following characteristics:  Uses baud rates up to 19,200 bit/s  Allows a maximum of 32 (0-31 decimal) nodes  Uses a maximum cable length of 1.2 km (4,000 ft

RS-232 (Serial) Connection:  An RS-232 serial port allows you to go online to a specific processor by connecting to the communications port of a computer:  Uses baud rates up to 19,200 bit/s  Requires physical connection to the processor to which you want to go online (cannot "see" other processors on the network)  Telephone and radio modems can be integrated into the RS-232 interface, thereby allowing communications over long distances.

Example: RS-232 Connection Channel 0 of SLC 5/03, SLC 5/04, and SLC 5/05 processors is used for an RS-232 connection. An example of an RS-232 connection is shown in the following graphic:

Universal Remote I/O Network:  A Universal Remote I/O network connects SLC 500 processors to remote I/O chassis and intelligent devices such as operator interfaces and AC and DC drives. The Universal Remote I/O network has the following characteristics:  Uses baud rates up to kbit/s  Allows remote I/O scanners to connect to a maximum of 32 I/O chassis or other adapter-type devices on a single link  Allows a maximum network length of 3,048 m (10,000 ft) at 57.6 kbit/s

Example: Universal Remote I/O An example of an SLC 5/04 processor with a 1747-SN scanner module on a Universal Remote I/O network is shown in the following graphic:

DeviceNet Network:  DeviceNet is a digital, multi-drop network to connect sensors, actuators and automation systems in general. It was developed for maximum flexibility between field equipment and interoperability among different manufacturers  A DeviceNet network has the following characteristics:  Uses baud rates up to 500 kbit/s  Allows up to 64 nodes  Has a maximum length of 487 m (1,600 ft)

Example: DeviceNet Network An example of an SLC 500 processor with a 1747-SDN DeviceNet scanner module on a DeviceNet network is shown in the following graphic:

ControlNet Network: A ControlNet network combines the functionality of Universal Remote I/O and Data Highway Plus. Control Net is a higher level, with up to 99 devices on a network. Generally uses coaxial cable with high level of shielding. It's purpose is interconnection of PLC units, HMI on the factory floor level up To upper management IT level. A ControlNet network has the following characteristics:   Uses baud rates up to 5 Mbit/s   Allows for up to 99 nodes   Allows data transfer distances of up to 30 km (18.6 miles) using fiber optic media

Example: ControlNet Network A SLC 500 processor with a 1747-SCNR ControlNet scanner module on a segment of a ControlNet network is shown in the following graphic:

EtherNet/IP Network:  An EtherNet/IP network is a local area network (LAN) that provides communications between various devices at 10 Mbit/s. This network, available for SLC 5/05 processors, is the fastest SLC 500 communications option. An EtherNet/IP network has the following characteristics:

Ethernet  Requires RJ45 connectors on both ends of a lOBaseT cable  Requires a PC Ethernet communications card  Uses baud rates from 10 Mbit/s to 100 Mbit/s  Allows unlimited nodes on the network with a maximum of 24 SLC 5/05 (32K and 64K) processor connections  Allows connections to the Internet via a 32-bit IP address