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3 Discrete Commands (%Q) been calculated and reported (via %AI reference +21 - %AI reference +27) to the PLC, this bit is automatically cleared. TCM unit in Calibration Mode: This bit is set when the TCM unit is in full calibration mode. During this period (approximately 3 seconds) temperature measurement is suspended. The PLC unit can prevent the TCM unit from going into calibration mode by setting the %Q reference +22 bit. TCM Operating Normally: This bit is a heart-beat that will indicate to the PLC that the TCM unit is operating normally and that returned information is a reliable indication of the state of the TCM. External Voltage Failure: This bit is set when the external voltage (+24V) is missing. TCM Error: This bit is set when the TCM unit has found some fault condition. An error code (%AI28) accompanies this bit to provide more detailled information. It can be either a hardware problem or a parameter error (that is, some parameter value is out of range). The reported errors have different priorities and they can mask the errors of a lower priority. The following table shows the relation between the error flags: Table 3-4. Relation Between Error Flags Priority Error Flag Masks 1 External Voltage Failure 2, 3, 4, 5, 6, 7, 8 2 Compensation Temperature out of range (0°C - 60°C) 3, 4, 5, 6, 7 3 Ch#n open/Reverse TC 4, 5, 6, 7 4 Ch#n Upper Alarm 5, 6, 7 5 Ch#n Upper Deviation 6, 7 6 Ch#n Lower Alarm 7 7 Ch#n Lower Deviation none 8 TCM Error none 9 PWM Output Shorted none Discrete command bits (%Q’s) activate the corresponding functions. Command bits (with the exception of %Q reference +19, +20 and +24) must be maintained, (that is, they will keep the corresponding function active only as long as the bit is set to a ‘1’). These bits are downloaded from the PLC to the TCM every PLC sweep and control the TCM functions. Each bit is listed in the table below, followed by a detailed description. 3-4 Temperature Control Module for the Series 90-30 PLC User's Manual – October 1997 GFK-1466
Table 3-5. %Q Discrete Command Bit Definitions Bit Command Bit Command 1 CH #1 Auto/Manual Mode 13 CH #7 Auto/Manual Mode 2 CH #1 Enable/Disable Output 14 CH #7 Enable/Disable Output 3 CH #2 Auto/Manual Mode 15 CH #8 Auto/Manual Mode 4 CH #2 Enable/Disable Output 16 CH #8 Enable/Disable Output 5 CH #3 Auto/Manual Mode 17 Spare 6 CH #3 Enable/Disable Output 18 Spare 7 CH #4 Auto/Manual Mode 19 Autotuning Method 8 CH #4 Enable/Disable Output 20 Do Autotuning 9 CH #5 Auto/Manual Mode 21 Spare 10 CH #5 Enable/Disable Output 22 Disable Calibration Mode 11 CH #6 Auto/Manual Mode 23 Spare 12 CH #6 Enable/Disable Output 24 Spare (Cancel Autotuning) Channel #n Auto/Manual Mode: When this bit is set the channel #n closed-loop control procedure will be activated. The temperature will be controlled per the Set-Point. When this bit is set to ‘0’, the output will operate with a period and duty-cycle as specified by the corresponding parameters . Channel #n Enable/Disable Output: This bit enables output driver for channel #n. When this bit is cleared, the channel #n output will be disabled. Autotuning Method: When the TCM unit is to perform the autotuning procedure, this bit indicates which of two possible autotuning methods will be used. If the bit is set, the step response method will be used (suitable for situations where there is interference between zones) otherwise the relay response autotuning method will be used (suitable for zones that operate completely independent of each other). Do Autotuning: This bit commands the TCM unit to perform the autotuning process (see Figure 3-1). When the TCM is commanded to do an Autotuning sequence (%Q reference + 20 is set) the recommended new parameters are multiplexed back to the PLC in register %AI reference +21 to %AI reference +27. This information should be validated by the user and then sent back to the TCM if parameters are acceptable. The TCM does not store the parameters automatically, it requires the PLC to send the new parameters. This ensures that the new values will be validated by the user Before the user sets this bit, the following settings should be prepared: • Required autotuning method set up (%Q reference +19) • The channels which will not be used must be inactive or must have disabled outputs. • The tuned channels must be active with the enabled outputs in the MANUAL mode. • A non-zero setpoint temperature must be set for each channel that will be tuned. • Only channels which do not exhibit any thermocouple error will be tuned. GFK-1466 Chapter 3 Configuration 3-5 3
Page 1 and 2: Programmable Control Products Tempe
Page 3 and 4: Content of This Manual Related Publ
Page 5 and 6: Contents Example 1.................
Page 7 and 8: Contents Table 1-1. Firmware Compat
Page 9 and 10: 1 Auto Mode Diagnostic functions Th
Page 11 and 12: Chapter 2 Installing the Temperatur
Page 13: Section 2: Installing the TCM The T
Page 16 and 17: 3 Module Configuration Data Discret
Page 20 and 21: 3 • The channels which will not b
Page 22 and 23: 3 Parameter Data (%AQ) A TCM Error
Page 24 and 25: 3 If any of the transferred paramet
Page 26 and 27: 4 PWM Output Period Auto-Tuning 1.
Page 28 and 29: 4 The following figure is an exampl
Page 30 and 31: 4 Closed-Loop Control Bias Lin.Cont
Page 32 and 33: 4 Power [%] 100% 0% -100% The follo
Page 34 and 35: 5 The series of pulses forces the p
Page 36 and 37: 5 • Period • Regulation Error L
Page 38 and 39: A 02-24-97 14:03 GE FANUC SERIES 90
Page 40 and 41: A %I0041 CH6_OE Channel #6 Output S
Page 42 and 43: A %R0099 CH7_SP CH7 Set Point %R010
Page 44 and 45: A |[ START OF SUBROUTINE LOGIC ] |
Page 47 and 48: Appendix B Specifications Tests and
Page 49 and 50: Appendix C Applications Heating and
Page 51: Implementing Low Voltage Bake-out A
Page 54: Index O Operating Temperature Setpo

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