Siemens 505-2557 installation and operation guide Function Enable Bits, Control Registers, Inputs

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Internal Register Structures (continued)

After the values are loaded to the module, WY registers are used like those shown in Table 3-5.

Table 3-5 Function Enable Bits

WY65	Channel 1±16	Low alarm enable bits
WY66	Channel 1±16	High alarm enable bits
WY67	Channel 1±16	Scaling enable bits
WY68	Channel 1±16	Digital filtering enable bits
WY69	Channel 1±16	Averaging enable bits
WY70	Channel 1±16	Peak hold enable bits
WY71	Channel 1±16	Valley hold enable bits
WY72	Channel 1±16	Fahrenheit/Centigrade select bits
WY73	Channel 1±16	Peak hold reset bits
WY74	Channel 1±16	Valley hold reset bits
WY75	Channel 1±16	Averaging reset with new value bits
WY76±96		(Not used)

Control Registers	The control registers (X and Y discrete I/O points) are the handshake bits
	and steering logic used to load the data into the SIMATIC 505±2557 module
	and to request special operations from the module. These registers consist of
	the discrete inputs and outputs of the module.
Inputs	The SIMATIC 505±2557 input module uses a total of 5 discrete inputs in
	advanced mode. Four of the inputs are used as handshake bits from the
	module to the PLC to indicate that alarm levels, scaling data, filter and
	averaging values and function enable bits have been transferred
	successfully to the module. (See Figure 3-4).
	The remaining input bit, X16, is used by the module to inform the controller
	that the module is ready to accept data.

3-8

Advanced Function Programming

SIMATIC 505±2557 Installation and Operation Guide

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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 Community CE Agency ApprovalsEuropean ApprovalDescription 100 Ohm, 10 Ohm, 120 Ohm RTDs, or Millivolt InputsOperating Modes Word Input to the PLC from the Module RTD Input to Digital Conversion Scale UnitsOut-of-Range Input SignalsEffect Effect of Voltage Input 10 Ohm Copper Resolution Input ResolutionSelecting 2 and 3 Wire or 4 Wire Operation Installing and Configuring the ModuleCalculating the I/O Base Power Budget Installing and Configuring the Module Configuring Millivolt Input Temperature orSelecting Fahrenheit Selecting DegreesCelsius or Selecting DataConfiguration Jumper Locations Base InsertingModule Into Wiring the Input Connectors Copper Wire Table at 25 Degrees CelsiusPress 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 Overview Advanced Software FunctionsIntroduction AdvancedJumper Setting the ModuleConfiguration Memory LoggingController I/O Input Registers Internal Register Structures Input and Output Register Offsets Input Channel DataInput Flag Bits Peak/Valley Hold Input WordsOutput Data Registers AveragingInputs Function Enable BitsControl Registers Discrete Handshake Inputs Outputs Data Identification BitsLoading Data into the Simatic 505±2557 Module Data Loading ProcessSample 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 Considerations When UsingTiming Overhead for Functions Enabled Timing ConstraintsDefault Function Values for Simatic 505±2557 Default ValuesDefault Function Values Additional Information about Each FunctionCentigrade or Alarm SetpointsDegrees Degrees FahrenheitDigital Filtering Hold AveragingPeak and Valley Hold Reset Flag BitsFunction PrecedenceTroubleshooting 10 Troubleshooting Flow Diagram Symptom Probable Cause Corrective ActionI/O Register Quick Reference 17 I/O Register Quick ReferenceOr K Memory Configuration Tables Page Addressing Worksheet Items Unique to the Simatic 505±2557 Module 18 Open RTD Status BitsTroubleshooting Specifications Table B-1 SpecificationsSpecifications subject to change without notice Jumper Settings Log Sheet Customer Response Business Reply Mail