User Manual for the HE693SNPMPX SNP Multiplexer
Contents
1. User Manual for the HE693SNPMPX SNP Multiplexer for GE Fanuc Series 90 PLCs Third Edition 29 November 2000 0080 03 0080 02 29 2000 3 MODEL NUMBER HE693SNPMPX SERIAL NUMBER WARRANTY REGISTRATION FORM Please fill out this form and return it to Horner APG This information is vital to Horner APG should warranty service be required This document is also used to keep you informed of new product enhancements software revisions and documentation updates IT ISIN YOUR BEST INTEREST TO FILL OUT AND RETURN THIS FORM Date of purchase Name Title Company Department Division Street Address City State Zip Area Code Phone Number Purchased from Distributor Please indicate the type of application where this product is to be used check all that apply Chemical processing Demo equipment Education Energy management Food processing Military Product assembly testing Waste processing Other specify product PDODO OOOO 4 29 2000 0080 02 Horner APG LLC APG Controls Division 640 North Sherman Drive Indianapolis Indiana 46201 ATTN Warranty Registration Department 0080 02 29 2000 5 This manual explains how to use the Horner APG SNP Multiplexer for use with the GE Fanuc Series 90 family of Programmable Logic Controllers Copyright C 2000 Horner APG LLC 640 North She2. RE De 5 ABOUT PROGRAMMING EXAMPLES 0640000 0 10 6 Revisions to TAS MM A A 7 GHAPTERA INTRODUCTIONS tains a 11 CHAPTER 2 INSTALLATION e e a 13 CHAPTER 3 POWER 15 CHAPTER 4 OPERATIONS tilo 17 10 29 2000 0080 02 5 0080 02 29 2000 11 1 CHAPTER 1 INTRODUCTION The Horner APG SNP Multiplexer SNPM is equipped with three 3 RS485 serial ports Two of these ports have been designed for direct connection to SNP Master devices i e Workmaster or an Operator Interface Unit while the third port is designed for direct connection to a Series 90 CPU programming port This document will refer to these ports as slave port 1 slave port 2 and master port because the SNP multiplexer emulates two slave ports and one master port The SNPM receives SNP command messages through the two slave ports and passes these commands to the master port Any SNP response messages are received by the master port and are relayed back to the inquiring slave port If both slave ports present command messages simultaneously the SNPM will arbitrate between the two slave ports sending one of the command messages and buffering the other The winner of the arbitration will then have control of the master port until the current SNP conversation i
3. a description of the problem proof of purchase post paid insured and in a suitable package ABOUT PROGRAMMING EXAMPLES Any example programs and program segments in this manual or provided on accompanying diskettes are included solely for illustrative purposes Due to the many variables and requirements associated with any particular installation Horner APG cannot assume responsibility or liability for actual use based on the examples and diagrams It is the sole responsibility of the system designer utilizing the SNP Multiplexer to appropriately design the end system to appropriately integrate the SNP Multiplexer and to make safety provisions for the end equipment as is usual and customary in industrial applications as defined in any codes or standards which apply Note The programming examples shown in this manual are for illustrative purposes only Proper machine operation is the sole responsibility of the system integrator 0080 02 29 2000 7 Revisions to This Manual This version 0080 02 of the SNP Multiplexer User Manual contains the following revisions additions and deletions 1 Converted manual into Word format 2 Changed company name from Horner Electric Inc to Horner APG LLC 8 29 2000 0080 02 0080 02 29 2000 9 Table of Contents arado nara OC a ADU
4. ND the master port The switch bank near slave port 2 is used only for slave port 2 configuration The table on the following page illustrates the DIP switch setting for the desired communication parameters Each bank of DIP switches is used to configure three parameters baud rate parity and number of stop bits All ports are forced to 8 data bits SNP protocol requires 8 data bits Table 2 1 Baud Rate Configuration SW3 5 2 swi Baud Rate OFF OFF OFF 300 Baud OFF OFF ON 600 Baud OFF ON OFF 1200 Baud OFF ON ON 2400 Baud ON OFF OFF 4800 Baud ON OFF ON 9600 Baud ON ON OFF 19200 Baud ON ON ON 19200 Baud Table 2 2 Parity Type Configuration SW5 SW4 Parity OFF OFF None OFF ON Odd ON OFF None ON ON Even Table 2 3 Stop Bit Configuration SW6 Stop Bits OFF 1 ON 2 The two slave ports can be configured with completely different communication parameters For example one port could be connected to a Workmaster with a baud rate of 19200 while the other slave port could be connected to a 1200 or 2400 baud modem Note however that the master port is configured using the slave port 1 settings 14 29 2000 0080 02 2 5 0080 02 29 2000 15 3 CHAPTER 3 POWER CONNECTIONS The SNP Multiplexer hardware can be powered by either the Series 90 or by the external suppl
5. lege level to 2 The first master might continue communicating while under the impression that the Series 90 is still at privilege level 3 To avoid this problem make sure that the master device requiring the higher privilege level logs on last allow the lower privilege level device to log on then invoke the higher privilege level device The SNP protocol is a complex protocol The SNP Multiplexer although complex in design should prove easy to implement into an end system and has been designed with ease of use in mind If the supplied cable is of insufficient length the following cable can be constructed by the user 18 29 2000 0080 02 MASTER TWISTED SHIELDED PAIRS 2 SNP PORT RXD 11 13 TXD RXD 10 12 TXD 5 8 14 RTS CTS 15 6 RTS RTS 14 CTS RTS 6 15 5 TXD 13 11 RXD TXD 12 10 RXD 9 TERM 5VDC 5 5 5VDC GRND 7 7 GRND SHLD 1 1 SHLD MALE 1200 METERS MAX FOR RUNS GREATER THAN 10 FEET DO NOT RUN 5VDC WIRE PIN 5 Figure 4 1 Cable Diagram
6. nation by HE APG of the allegedly defective part or parts THIS WARRANTY IS EXPRESSLY IN LIEU OF ALL OTHER WARRANTIES EXPRESSED OR IMPLIED INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR USE AND OF ALL OTHER OBLIGATIONS OR LIABILITIES AND HE APG NEITHER ASSUMES NOR AUTHORIZES ANY OTHER PERSON TO ASSUME FOR HE APG ANY OTHER LIABILITY IN CONNECTION WITH THE SALE OF THIS SNP MULTIPLEXER THIS WARRANTY SHALL NOT APPLY TO THIS SNP MULTIPLEXER OR ANY PART THEREOF WHICH HAS BEEN SUBJECT TO ACCIDENT NEGLIGENCE ALTERATION ABUSE OR MISUSE HE APG MAKES NO WARRANTY WHATSOEVER IN RESPECT TO ACCESSORIES OR PARTS NOT SUPPLIED BY HE APG THE TERM ORIGINAL PURCHASER AS USED IN THIS WARRANTY SHALL BE DEEMED TO MEAN THAT PERSON FOR WHOM THE SNP MULTIPLEXER 1 ORIGINALLY INSTALLED THIS WARRANTY SHALL APPLY ONLY WITHIN THE BOUNDARIES OF THE CONTINENTAL UNITED STATES In no event whether as a result of breach of contract warranty tort including negligence or otherwise shall HE APG or its suppliers be liable of any special consequential incidental or penal damages including but not limited to loss of profit or revenues loss of use of the products or any associated equipment damage to associated equipment cost of capital cost of substitute products facilities services or replacement power down time costs or claims of original purchaser s customers for such damages To obtain warranty service return the product to your distributor with
7. o LED s one near each slave port At power up both LEDs will light during the SNPM internal initialization and diagnostics When both LEDs go out the initialization sequence is complete The SNPM is then ready to accept SNP command messages through the slave ports During operation the LEDs are used to indicate which of the slave ports is currently in control of the master port For example if slave port 1 is given control of the master port all SNP command data received by slave port 2 is buffered When slave port 1 s SNP conversation is complete slave port 1 releases control of the master port and slave port 2 is given control of the master port the buffered message is sent to the master port To gain a better understanding of the SNPM operation a brief discussion of the SNP protocol is necessary SNP protocol is comprised of SNP messages The SNP master device issues command messages and the SNP slave devices return response messages Each of these messages are relatively short usually 40 to 50 bytes each but they can be as long as 8000 bytes An SNP conversation however can consist of several command response transactions and cannot be interrupted For example if slave port 1 were conducting a multi message conversation with the Series 90 CPU perhaps doing a program load and slave port 2 were to issue a request for reference table data the Series 90 CPU would confuse the data request for program information The SNPM is in
8. rman Drive Indianapolis Indiana 46201 All rights reserved No part of this publication may be reproduced transmitted transcribed stored in a retrieval system or translated into any language or computer language in any form by any means electronic mechanical magnetic optical chemical manual or otherwise without the prior agreement and written permission of Horner APG LLC All software described in this document or media is also copyrighted material subject to the terms and conditions of the Horner Software License Agreement Information in this document is subject to change without notice and does not represent a commitment on the part of Horner APG LLC For user manual updates contact Horner APG Technical Support Division at 317 916 4274 or visit our website at www heapg com 6 29 2000 0080 02 LIMITED WARRANTY AND LIMITATION OF LIABILITY Horner APG LLC HE APG warrants to the original purchaser that the SNP Multiplexer manufactured by HE APG is free from defects in material and workmanship under normal use and service The obligation of HE APG under this warranty shall be limited to the repair or exchange of any part or parts which may prove defective under normal use and service within two 2 years from the date of manufacture or eighteen 18 months from the date of installation by the original purchaser whichever occurs first such defect to be disclosed to the satisfaction of HE APG after exami
9. s complete When the conversation ends the buffered command message is sent to the master port and the loser of the arbitration will have control of the master port until it s conversation ends To simplify the SNP Multiplexer allows the user to connect TWO SNP master devices i e a Workmaster Operator Interface Unit Thumbwheel Interface Unit etc to a single Series 90 CPU Each of the SNPM slave ports can be a single node on an SNP network however the SNPM master port must be connected to one and only one Series 90 CPU The SNP Multiplexer does NOT support the Hand Held programmer 12 29 2000 0080 02 1 5 0080 02 29 2000 13 2 CHAPTER 2 INSTALLATION The SNP Multiplexer can be panel mounted or used as a desktop accessory An optional 15 pin cable is available for connection between the SNPM master port and the Series 90 programming port The pin out for the two slave ports is identical to that of a Series 90 programming port therefore any cables used for connection to the Series 90 can be connected to either SNPM slave port Note however that the SNPM does not support the Hand Held programmer The SNPM is equipped with two banks of DIP switches accessible from the slave port end of the unit These switches are used to configure the communications parameters for all three of the SNPM ports The switch bank located near slave port 1 is used to configure slave port 1 A
10. telligent enough to recognize the end of an SNP conversation A buffered command message will not be sent to the master port until the current conversation is complete There are however some timing considerations to account for when using the SNPM The SNP protocol has some built in timeouts For example if an SNP master does not receive a response to a command message within a specified time limit the master device will timeout and will attempt to re establish the communications link most likely generating an error message on the user interface This scenario although not serious can be annoying if it occurs frequently Consider a situation where one slave port is configured for 300 baud and the other is configured for 19200 baud During a lengthy SNP conversation at 300 baud a command message is received at 19200 baud and buffered It is likely that the 19200 baud master device will timeout waiting for a response from the slave because the amount of time required to complete the 300 baud conversation exceeds the SNP timeout The SNPM will yield better performance if both ports are configured for 1200 baud or higher Another anomaly surfaces when two SNP master devices are used and both devices set the privilege level For example assume that the master device connected to slave port 1 logs on to the Series 90 and sets the privilege level to 3 After which the master device connected to slave port 2 logs on to the Series 90 and sets the privi
11. y The 5VDC connection on the two slave ports can only be driven by an external supply The SNP Multiplexer can be powered by 24Vdc This supply is only necessary if one of the following conditions exist 1 The cable between the SNP Multiplexer and the Series 90 CPU is greater than 10 feet in length In this case the external power supply must be connected AND the power selection jumper must be placed in the EXT 24V position this jumper is accessed by removing the base plate 2 A device is to be connected to one or both of the slave ports that requires the 5VDC power on the slave port connector i e the Horner APG Operator Interface Unit or the Horner APG Thumbwheel Interface Unit The power select jumper JP4 a four pin jumper located on the multiplexer circuit board near the power connector selects between 24VDC and 5VDC operation To gain access to the jumper remove the four screws on the rear cover plate and remove the plate Do not remove the top cover of the multiplexer The jumper configuration is as follows JP4 JP4 Figure 3 1 24V Operation from Figure 3 2 5V Operation from External 24V Supply through Series 90 SNP Port through Pin Terminal Connector 5 of Master Port 16 29 2000 0080 02 3 5 0080 02 29 2000 17 CHAPTER 4 OPERATION With the SNPM installation and configuration complete the SNPM can now be powered up The SNPM is equipped with tw
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