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Explicit Program End

If you are observing behavior that indicates that the controller is continuing to control beyond the end of the steps you have in your program, check to be certain that you have a step at the end of your program that points to step 100 to end the process. Otherwise, if there are some unused steps further up in program memory, they may be getting executed in error. Be sure that any unused steps that are in the middle of your program have been changed to null steps (ramp and hold time both = 0).

Blowers Misbehaving

If the blowers seem to behave differently than you expect, check the Blower Shutoff Mode setup parameter (F15).

Program hangs on Ramp as Quickly as Possible step

Note that a program step with specified ramp and hold times will terminate at the end of the specified time (ramp time + hold time), regardless of whether the controller was able to achieve the setpoint. On the other hand, a maximum speed ramp step (substep 1 = 00.00 & substep 2 = 99.00) will not advance to the next step until and unless the setpoint is achieved. If the unit under test generates or absorbs heat in a manner that prevents the test environment from ever becoming stable at the setpoint, the program will “hang” on such a step as it will not advance to the next step unless it can stabilize the platform or chamber at the setpoint.

9.7.7 Diagnosing and Solving Remote Mode Problems

General Considerations & CC-3 Compatibility

Bus communication problems often involve command syntax errors. The Sigma C4 is NOT case sensitive. The command “GT” is satisfied by “Gt”, “gT”, or “gt”. Each command line should be properly terminated with both a CR (ODh) and LF (10h), but the C4 can fix the problem if one of the termination characters is present. The C4 fixes up extra spaces, tabs, and commas. The C4 ignores EOI. The model CC-3 controller does not have a fault tolerant parser. If programs that use only CC-3 compatible commands run properly on the C4, but not on the CC-3, the problem is likely a command syntax problem that the C4's fault tolerant parser corrects.

C4 Manual Rev 7.5.2

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Contents Sigma Systems Programmable Temperature Controller / InterfaceC4 Manual Rev Table of Contents Intelligent 2 Probe Control C4 Manual Rev C4 Manual Rev C4 Manual Rev C4 Manual Rev Models C4 & CC-3.5Explained IntroductionGeneral Description Release 7.5.2 Firmware Custom Features / Interchangeability WarningC4 vs. CC-3 Differences What’s New Firmware Uploads Forced Start from Prom Firmware Internal Error Shutdown Conditions Intelligent 2 Probe Control Probe Averaging Program Mode Step Insert & Delete RSA Remote Mode Setup Parameter Commands Front Panel Physical DescriptionMode Switch Clear Prog J1 TOP Rear Panel ConnectionsC3-5 Rel General Operation & Error Conditions200 100c 392 148f Startup DisplaysUpdating Firmware Upgrading Firmware by Prom Replacement Making the physical connection for upload Rs load Restoring Setup Parameters to Default ValuesSu res Ee busy and then su doneC4 Manual Rev Fahrenheit Operation P1fSystem Operating Temperature Range P1 lo P1 hiProbe Out of Range Shutdown P1 err P1 -err Internal Error Shutdown Conditions Res errAll res Software Probe Correction Calibration Su errStatus and Error Reporting Fail-safe System C4 Manual Rev Intelligent 2 Probe Control How Intelligent 2 Probe Control functions Preparing for Intelligent 2 Probe Control Using Intelligent 2 Probe Control Displaying Temperature Local Mode Basic OperationS1 102.6 s1f S1 nsp S1f nspDisplaying and Changing the Setpoint Sor -sor Sp errControlling to a Setpoint C4 Manual Rev Program Mode 06.0Description of a Program Step 00.1 Substep Step Data 00.0Ramp time 00.2Maximizing Ramp Speed & Other Ramp Considerations Displaying Program Steps not during execution Clearing Program Memory Reinitializing program stepsEntering or Changing a Program Step Insert Program StepPress CLEAR/ENTRY Delete Program step Press CLEAR/ENTRY Press CLEAR/ENTRY againRunning Executing a Program Program Run Time Information/Considerations 007 nop2 Loop005 sor Sor Special Commands External Compressor On Common Programming Issues C4 Manual Rev Remote Mode EIA-232 InterfaceIEEE-488 Interface System Information Queries Command Summary by functional groupSystem Information Queries For Celsius mode For parameters numbered 0 through C4 Manual Rev Operation Information Queries & Commands REerror byteCRLF C4 Manual Rev Qccrlf PTnCRLF Setup Parameter Commands SC1 0 2.3 100 WP 6 5 5CRLF Upcrlf System Operation Commands Celsius mode Will hold the current setpoint for 1 hour and 20 minutes U1c 65.0 u1f IEEE-488 Gpib Error and Status Reporting OverviewTemperature in 20 minutes C4 Manual Rev Error/Status String Bit Definitions C4 Manual Rev Setup Mode PID controller, Integral term Adjustment not Displaying the Field Values Changing the Value of a Setup Field Two Probe Mode Setup fieldAuto-start Mode Setup field Temperature Control Terms PID Setup fields 0, 10, 11 Blower Shut-off Mode Setup fieldEntering probe correction setup data C4 Manual Rev C4 Manual Rev Programming Examples & Notes Appendix00.2 00.000.3 00.4Using shortcuts to shorten program entry time DISP/CNTLSTART/STOP 9900CLEAR/ENTRY 6 Enter 04.2 04.004.3 04.407.2 07.007.3 07.4C4 Manual Rev Sigma Systems C4 Programming Worksheet Sample Command Structure for IEEE-488 Gpib Operation Disp A$ Installation and Use of TTL Outputs and Input 101 Field Calibration of Model C4 Controller102 103 TroubleshootingNoise Immunity 105 Firmware Upload Problems 107 Temperature Control PID Tuning & Problems108 109 110 111 Technical Support, Repairs & Returns U1f 102.7113 Index114 115 GpibIEEE488 Gpib 117 118 119 SRQ120