Wiring the Input Connectors | Siemens 505-2557 manual

2.2Wiring the Input Connectors

RTD input signals are accepted through a 64 position fixed connector with wire press in terminals located on the front of the module. Consult the RTD manufacturer's recommendations for selecting the input wire type and size. The connector will accept 18 to 30 AWG wire.

The SIMATIC 505±2557 uses a fixed connector to terminate field wiring. This is used because the chemistry of a removable connector may have an adverse effect on the accuracy of the measurement. Siemens has carefully selected a connector that minimizes this effect.

Refer to Figure 2-5 for correct wiring for 2, 3, or 4 wire RTDs to the SIMATIC 505±2557. Each channel consists of four press in terminals. Insert wire by using a small screw driver to depress the spring tension lever and then insert the wire. Solid core wires may be pushed in without depressing lever.

Remove wire by depressing spring lever to remove tension and then remove lead wire. (See Figure 2-4)

The SIMATIC 505±2557 may compensate for up to 20 Ohm of lead resistance per wire. Use the table in Figure 2-1 in planning the maximum distance the RTD may be located from the module.

Figure 2-3 Copper Wire Table at 25 Degrees Celsius

2-8

Installation

SIMATIC 505±2557 Installation and Operation Guide

Image 25

Siemens 505-2557 installation and operation guide Wiring the Input Connectors, Copper Wire Table at 25 Degrees Celsius

Contents

Simatic Copyright 1998 by Siemens Energy & Automation, Inc Manual Publication History List of Effective Pages Contents Iv Contents List of Figures List of Tables Preface European Agency ApprovalsCommunity CE Approval 100 Ohm, 10 Ohm, 120 Ohm RTDs, or Millivolt Inputs Description Operating Modes Word Input to the PLC from the Module Scale Units RTD Input to Digital Conversion Effect SignalsOut-of-Range Input Effect of Voltage Input 10 Ohm Copper Input Resolution Resolution Calculating the I/O Base Power Budget Installing and Configuring the ModuleSelecting 2 and 3 Wire or 4 Wire Operation Installing and Configuring the Module Configuring Selecting Temperature orMillivolt Input Celsius or Selecting DegreesFahrenheit Selecting Data Configuration Jumper Locations Module Into InsertingBase Copper Wire Table at 25 Degrees Celsius Wiring the Input Connectors Press In Wiring Connector Wiring Diagram for 2, 3, or 4 Wire RTD Wiring Diagram for Millivolt Measurements Cable Grounding Example I/O Configuration Chart Advanced Function Programming Introduction Advanced Software FunctionsOverview Advanced Configuration Setting the ModuleJumper Controller I/O LoggingMemory Input and Output Register Offsets Internal Register StructuresInput Registers Input Channel Data Peak/Valley Hold Input Words Input Flag Bits Averaging Output Data Registers Control Registers Function Enable BitsInputs Discrete Handshake Inputs Data Identification Bits Outputs Data Loading Process Loading Data into the Simatic 505±2557 Module Sample Low and High Alarm Setpoints Identifying the Data Being Transferred 11 Enabling the Functions Loaded Loading Programs into the I/O Module 13 Startup Relay Ladder Logic Page Timing Overhead for Functions Enabled When UsingTiming Considerations Timing Constraints Default Function Values Default ValuesDefault Function Values for Simatic 505±2557 Additional Information about Each Function Degrees Alarm SetpointsCentigrade or Degrees Fahrenheit Digital Filtering Peak and Valley AveragingHold Flag Bits Hold Reset Precedence Function Troubleshooting Symptom Probable Cause Corrective Action 10 Troubleshooting Flow Diagram 17 I/O Register Quick Reference I/O Register Quick Reference Or K Memory Configuration Tables Page Addressing Worksheet 18 Open RTD Status Bits Items Unique to the Simatic 505±2557 Module Troubleshooting Table B-1 Specifications Specifications Specifications subject to change without notice Jumper Settings Log Sheet Customer Response Business Reply Mail