SIMATIC 505-2571

Program Port Expander

User Manual

Order Number: PPX:505??8131??1

Manual Assembly Number: 2806135??0001

Original Edition

Contents

Chapter 1 PPX:505-2571 Module Description

Module Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

Chapter 2 Installing the Module

Contents iii

List of Figures

iv Contents

List of Tables

Contents v

Preface

This user manual provides installation and operation instructions for the SIMATIC??? 505-2571 Program Port Expander Module for Series 505??? programmable controllers. We assume you are familiar with the operation of Series 505 programmable controllers. Refer to the appropriate SIMATIC user documentation for specific information on the controllers and I/O modules.

This user manual is organized as follows:

???Chapter 1 provides a description of the module.

???Chapter 2 covers installation and checkout.

???Chapter 3 describes operation of the module.

???Chapter 4 discusses troubleshooting.

Chapter 1

PPX:505-2571 Module Description

Module Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

Module Features The PPX:505-2571 Program Port Expander Module is a member of the communication family of I/O modules for the Series 505 programmable controllers. The PPX:505-2571 is a single-wide, Special Function module that provides four additional communications ports that function like the program port provided on the CPU front panel.

Ports 1 and 2 have an electrical interface that is a subset of RS??232C using a male DB9 connector. Ports 3 and 4 provide an RS??422 electrical interface using a female DB9 connector. Both interfaces have been chosen to match the programming ports provided on the SIMATIC 545 programmable controller. Thus, commonly used cables can be used with the PPX:505-2571.

The ports may be configured to support baud rates of 1200, 2400, 9600, and 19,200. All four ports may be used simultaneously with a combined aggregate baud rate of 38,400 baud (for example, all four ports at 9600 baud). The PPX:505-2571 has two communication indicators for each port, one for transmit and one for receive. These indicators light when communications activity is taking place.

The red ??Active?? indicator is used to indicate module status. The indicator is illuminated when the module is functioning properly. See the troubleshooting section for additional details.

As control systems become more complex and dispersed, the demand for attaching serial devices has increased. Serial devices are typically used to provide operator interface, to run supervisory control and monitoring packages, and to facilitate controller programming support.

Most Series 505 controllers today are equipped with two serial ports to accommodate the minimum requirement. However, these ports can be consumed with the supervisory control package and one operator device. Some controllers, like the SIMATIC 525, provide only an RS-232 port, limiting reliable communications to about 50 feet at higher baud rates.

The PPX:505-2571 provides two additional RS-232 ports and 2 additional RS-422 ports in addition to the standard controller ports. These additional ports may be used to attach various types of serial devices which conform to the Non??Intelligent Terminal Protocol (NITP). Devices requiring the Transparent Byte Protocol (TBP) must be connected to the CPU or the RBC serial port.

The simplest of these types of devices are COROS TD/OP operator panels. These operator interfaces provide for direct access to controller memory locations for read and/or write capability through an RS-422 direct connection. Devices attached through the RS-422 interface may be located up to 4000 feet away.

More sophisticated applications may require the monitoring of a large number of variables in the controller. There are a number of third party applications available that may be used to access data from the controller and perform statistical process control, trending, report generation and other applications. These third party applications typically run on a PC or other platform but most all of them communicate to the controller directly through the program port. Often times there are multiple nodes that need to be connected to the controller. With the PPX:505-2571 this may easily be accomplished. See Figure 1-2.

Figure 1-2 Process Monitoring Application Using PCs

Using a notebook PC running the SIMATIC TISOFT??? application, a maintenance engineer can easily make changes in the controller program or adjust timer and/or drum preset values. During start up conditions a PC may be attached to a serial port to aid in the debugging process. The additional ports on the PPX:505-2571 make it possible to access locally the controller. See Figure 1-3.

Figure 1-3 Attaching a Lap Top PC

2.1Getting Started

The installation of the PPX:505-2571 Programming Port Expander Module consists of the following steps:

! CAUTION

The components on the PPX:505-2571 module printed circuit card can be damaged by static electricity discharge.

To prevent this damage, the module is shipped in a special anti-static bag. Static control precautions should be followed when removing the module from the bag, and when handling the printed circuit card during configuration.

After discharging any static build??up, remove the module from the anti-static bag. Do not discard the static bag. Always use this bag for protection against static damage when the module is not inserted into the

I/O base.

Table 2-1 Baud Rate Switch Settings

On

Off

Not Used (Set to Off)

Hardware

Handshaking

Baud Rate

Example:

Dipswitch #1, #2 and #3 are shown in the ??OFF?? position for Port 1 indicating a baud rate of 9600 and hardware handshaking disabled.

Figure 2-1 Location of Baud Rate Switches

Getting Started (continued)

DB9

RS-422

Figure 2-2 Connector Pin-Out Description

505 I/O MODULE DEFINITION FOR CHANNEL . 1 BASE . . . 00

Figure 2-3 Sample I/O Configuration Chart

Getting Started (continued)

In Figure 2-3, the PPX:505-2571 module is installed into slot 1 and I/O base 0. For your particular installation, look in the chart at the slot address occupied by the module in your configuration. If the WX and WY values are the same as those shown in the example above and Special Function = YES then the module is logged into the controller memory and is ready for operation. If the line is blank or erroneous, re-check the module to ensure tthat it is firmly seated in the I/O base slot. Generate the PLC I/O configuration chart again by reading the I/O base. If still incorrect contact the Siemens Energy & Automation, Inc., Technical Services Group in the U.S.A. at 423??461??2522. In other countries, you can also contact the nearest Siemens distributor.

Use the attached operator interface device(s) to send commands to the controller and validate the resulting response. If you encounter a problem, refer to Chapter 4, Troubleshooting.

Chapter 3

Module Operation

The PPX:505-2571 is designed to work with operator interface devices which adhere to the Non??Intelligent Terminal Protocol (NITP). Up to four supported devices may concurrently communicate with the controller. The PPX:505-2571 will provide buffering for the commands from the operator interface and responses from the controller. Commands are sent to the controller in the order they are received; no port has priority over any other port. Only one command per port can be pending at a given time; a response must be sent to the operator interface before a subsequent command will be accepted. With a few minor restrictions, the PPX:505-2571 port should function the same as the controller program port.

NOTE: The ACTIVE indicator should remain on at all times after power up. Should the ACTIVE indicator go out or exhibit a blink pattern, refer to the troubleshooting section. When data is sent to a port the RCV indicator for that port should light briefly. Similarly, when data is sent from a port the XMT indicator should light briefly.

This release of the PPX:505-2571 does not support Transparent Byte Protocol (TBP). In addition, the PPX:505-2571 does not support an ASCII print data stream.

Effect of Controller Because the PPX:505-2571 is a Special Function module, the controller scan Scan Timetime will be longer when the module is logged into the controller. The effect

on scan time depends on several factors, including the type of request the controller is processing and the number of requests processed per scan. Some requests, such as a Read or Write memory location, can be processed relative quickly. Others, such as Find, consume significant controller CPU resources.

The SIMATIC 545 CPU can process a maximum of eight requests per scan. It is possible for the user, via Aux 16, to set the number of requests (task codes) that are processed each scan, for a minimum of one to a maximum of eight. A lower number should normally result in a faster controller scan time; the amount of increase depends on the type of request. However, since more requests can be processed each scan, this may improve data throughput through the PPX:505-2571.

The requests are processed during the discrete portion of the controller scan (refer to Chapter 1 of the SIMATIC 545/555/575 System Manual for a discussion of the timeline). Thus, the scan interval to process the requests from the PPX:505-2571 (or any other Special Function module) cannot be lengthened by manipulating the time slices, which affect only the analog portion of the scan.

To maximize throughput, the PPX:505-2571 should be placed in the local base with the controller. A PPX:505-2571 module in the local base has the advantage of 8-bit parallel data transfer to the controller across the backplane. A remote I/O module must communicate with the controller via a serial data stream. A local base module also has a few milliseconds advantage because it is not subject to the remote base timing restrictions. These advantages add up to an order of magnitude improvement in local base execution time over remote base.

Whether the effect on scan time is significant or not depends upon your application. If your controller is lightly loaded and/or task code requests routed through the PPX:505-2571 are simple, then you may not notice the effect at all. On the other hand, if the controller is heavily loaded, scan times are critical, and complex requests are being sent to the controller, you may have to make some trade-offs between controller performance and the time required to respond to task code requests. In general, you will have to make any adjustments based on actual experience.

Table 4-1 Troubleshooting Matrix