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SIMATIC TIWAY 1
UNILINK Host Adapter
User Manual
Order Number: PPX:TIWAY–8121–2
Manual Assembly Number: 2587871–0045
Second Edition
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CHAPTER 1 THE UNILINK HOST ADAPTER 1.1 INTRODUCTION The UNILINK Host Adapter, Figure 1–1 is a second generation host computer interface product that allows a host computer to operate and control secondary devices on a TIWAY I network. The UNILINK Host Adapter, also referred to as the “adapter” in this manual, is a hardware and software extension of the original TIWAY I Host Adapter. Figure 1–1 UNILINK Host Adapter 1–1 UNILINK HOST ADAPTER USER MANUAL
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THE UNILINK HOST ADAPTER 1.2 FEATURES The hardware is composed of the UNILINK Adapter, shown in Figure 1–1, with a plug-in Personality Interface Module (PIM) PPX:500–6224. The PIM, shown in Figure 1–2, contains the software that causes the UNILINK Adapter to operate as the UNILINK Host Adapter. Figure 1–2 Personality Interface Module (PIM) Figure 1–3 illustrates the basic structure of the UNILINK Host Adapter. The corresponding physical features are shown in Figure 1–4. It includes an RS–232–C/
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THE UNILINK HOST ADAPTER Host Computer RS–232–C/RS–423A Host Interface (Command Processor) UniLink External Host Adapter TIWAY I Interface Input Point Output Point TIWAY I Network Secondaries Figure 1–3 UNILINK Host Adapter Block Diagram Host Computer Port Power Connections Port Port Port Port AC AC GND 1 2 3 4 NEUT LINE I/O 1 2 3 4 5 TIWAY I Ports External I/O Points PPX:500–7111, Dual Local Line media ports shown here. Figure 1–4 UNILINK Host Adapter Physical Features 1–3 UNILINK HOST ADAPTE
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THE UNILINK HOST ADAPTER The features of the UNILINK Host Adapter include: The adapter is noise hardened for factory floor use. There are internal diagnostics tests to check the internal operation when powered-up or reset, and during normal operation. There is also a selectable test mode that is set locally. The adapter can be reset locally with an internal switch or remotely with a host issued command. The adapter supports secondary-to-secondary communications without complex host softw
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THE UNILINK HOST ADAPTER The adapter is configurable for a variety of applications needs and includes multiple host computer support, allowing several host computers to communicate with the secondary devices on the same TIWAY I network. The adapter provides transaction statistics collection to aid network performance tuning. 1.3 TYPICAL NETWORK APPLICATIONS Figure 1–5 illustrates a typical single host network managing a process control application. The host computer application directs the s
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THE UNILINK HOST ADAPTER The flexibility of the UNILINK Host Adapter also provides for multiple hosts as illustrated in Figure 1–6. In addition to the process control application, your main plant system can link to the same network to track work-in-progress, adjust schedule loads for peak efficiency, and collect product cost data. With an additional UNILINK Host Adapter, you can also add a personal computer workstation to the network for statistical quality control or other uses. Host Host Compu
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THE UNILINK HOST ADAPTER 1.4 TIWAY I SYSTEM CHARACTERISTICS TIWAY I is a bus structure Local Area Network (LAN) designed for industrial environments. The TIWAY I network connects a series of Texas Instruments Programmable Controllers (P/Cs) and other devices to one or more host computers. With the network, you can obtain, modify or replace data stored in any of the following Siemens products: SIMATIC TI520 /SIMATIC TI530 / SIMATIC TI520C /SIMATIC TI530C P/Cs SIMATIC
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THE UNILINK HOST ADAPTER With appropriate host software, an operator can program, monitor, and control any P/C or other intelligent device on the TIWAY I network from a single location. The importance of the UNILINK Host Adapter is that it provides a communication link between the TIWAY I network and one or more host computers. Figure 1–7 is a diagram representing the various host computers that can be connected to a UNILINK Host Adapter, and the typical devices that can be controlled in a TIWAY
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THE UNILINK HOST ADAPTER 1.5 INSTALLATION Instructions for installing the UNILINK Adapter and the UNILINK Host Adapter PIM are given in the UNILINK Adapter Installation and Operation Manual (PPX:TIWAY–8106). It provides the electrical and mechanical installation instructions and guidelines for the the UNILINK Host Adapter. Chapter 2 discusses the different operational modes and how they are configured. Chapter 3 discusses the host computer interface port, Port 3, and how to set the dipswitches t
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CHAPTER 2 OPERATION AND APPLICATION 2.1 INTRODUCTION This chapter provides an introduction to the UNILINK Host Adapter operation and how it can be used in typical applications. You should refer to Chapter 5 for the complete command syntax and to the Glossary for help with any unfamiliar terms. Network planning forms are located in Appendix E, Appendix F, and Appendix G. 2.2 COMMAND PROCESSING The UNILINK Host Adapter commands are a set of functional tools to help you direct network applications
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OPERATION AND APPLICATION Network Manager Commands Performance Extended HIU and Commands Applications Flexibility Configure Adapter Commands Mode Independent Commands Basic HIU Commands NUMBER OF COMMANDS Figure 2–2 Performance vs Commands Communications between the host computer and the UNILINK Host Adapter are a series of commands and responses as illustrated in Figure 2–3. For every command sent, there will be a response. The response will be one of the following. An ackn
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OPERATION AND APPLICATION Secondary Commands Host UNILINK Computer Host Adapter Responses Secondary Figure 2–3 Host Computer To UNILINK Host Adapter Communications Commands are checked for errors before they are executed. The ERROR RESPONSE is a special response that returns a code indicating the type of error. If an error is found, the command will not be executed and the ERROR RESPONSE will be returned. The ERROR RESPONSE will also be returned if a network request does not complete within the
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OPERATION AND APPLICATION 2.3 FUNCTIONAL ORGANIZATION AND OPERATING MODES The UNILINK Host Adapter is organized into two primary functions; the Host Interface Unit (HIU) function and the Network Manager (NM) function. An adapter can be configured with one of these functions or they can be combined to form a Master Host Interface Unit (MHIU). The MHIU, HIU, and NM are three of the six configurable operating modes. In addition to the above modes, there are two Emulate Host Adapter (EHA) modes and
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OPERATION AND APPLICATION HIU Establishes communications between the host computer and the secondary devices. Uses memory for: Macro Buffers (Dynamically allocated) Host–to–Secondary Statistics Figure 2–4 Host Interface Unit Function Part of the statistics memory area is used for a Secondary Log. As commands are issued to connect and disconnect secondaries, the specified secondary address is added or deleted from the Secondary Log and a network request is queued into the Network Manager. In the
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OPERATION AND APPLICATION 2.3.2 Network Manager Function Acting as the network primary, the Network Manager function is responsible for controlling the message traffic on the TIWAY I network as shown in Figure 2–5. It receives the requests from HIUs and stores them in a NM buffer, routes them to the designated secondary devices, and returns the secondary response to the HIU that issued the request. There can be only one adapter configured with the Network Manager function in any particular TIWAY
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OPERATION AND APPLICATION The following operational modes include the NM function. However, the MHIU/EHA mode does not provide access to the NM command set. Master Host Interface Unit (MHIU) Network Manager (NM) Standalone Network Manager (SANM) Master Host Interface Unit/Emulate Host Adapter (MHIU/EHA) 2.3.3 The Master Host Interface Unit Mode The Master Host Interface Unit (MHIU) is a combination of the HIU and NM functions as shown in Figure 2–6. A host computer connected to an MHIU c
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OPERATION AND APPLICATION 2.3.4 Typical Network Applications Both single and multiple host networks are supported by the UNILINK Host Adapter. Figure 2–7 illustrates a typical single host network which uses an MHIU as the host interface and network manager. Host Com- puter RS–232–C/RS–4 23–A Host Interface Cable UNILINK TIWAY I UniLink Host Adapter ( MHU) Figure 2–7 Typical Single Host Network Multiple host networks can be configured with a variety of adapters in different operating modes as il
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OPERATION AND APPLICATION Host Host Com- Com- puter puter UNILINK UNILINK UniLink Host UniLink Host Adapter (MHU) Adapter (MHU) Figure 2–8 Typical Multiple Host Network Host Host Com- Com- puter puter UNILINK UNILINK (HIU) (HIU) Host UNILINK Com- puter Figure 2–9 NM Network 2–9 UNILINK HOST ADAPTER USER MANUAL
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OPERATION AND APPLICATION 2.3.5 The Emulate Host Adapter Modes There are two modes available that provide an emulation of the TIWAY I Host Adapter; the MHIU/EHA and the HIU/EHA. These modes are limited to the base command codes 01 through 08, 20, 21, and FC through FF. The POLL command, code 03, is not available in the HIU/EHA mode. Both of these modes will operate with applications software written for the TIWAY I Host Adapter. The MHIU/EHA can directly replace the TIWAY I Host Adapter in singl
