IBM System/7 Functional Characteristics - All about the IBM 1130 ...

11111811111111.1.1.14.111.1111I II 0 I 0The 5014 Analog Input Module Model Cl converts analog signals into binary values of 14bits plus sign. These analog signals can be within the range of -±10 mV full scale to ±5.12Vfull scale.This analog input module can be located in any or all of the I/O module positions withinan IBM 5026 Enclosure. (Location 00 in the 5026 is the processor module location.)FUNCTIONAL DESCRIPTIONI/O COMMANDSIn addition to logic controls, the model C I I/O module consists of an analog-to-digitalconverter (ADC), an amplifier, and a differential solid-state multiplexer.The solid-state multiplexer can have as many as 128 two-wire differential analog inputpoints, in eight groups of 16 points each. With high-level inputs (±5.12V), a scanningspeed of 20,000 points per second can be attained. A scanning speed of 14,000 points persecond can be achieved with low-level inputs (10 to 640 mV). A scanning speed of7,000 points per second can be obtained with the use of automatic gain selection. Theactual scanning rate obtained, however, depends on the input voltage value, the physicallocation of the I/O module, and the programming techniques used. Conversion time requiredby the ADC varies from 25 to 46 microseconds, depending on the input voltage.Additional delays due to module location and programming must also be considered whencomputing the actual scanning rate.One amplifier is required to service all of the analog input points. If all analog inputsare at the -±5.12V level, the high-level amplifier is used. If a range of voltage levelsmust be accommodated, a multirange amplifier is used.The multirange amplifier can be program controlled to one of the seven different ranges,or to automatically select the appropriate amplifier gain. When the amplifier is programmedto automatically select the gain, analog signal resolution is reduced to 12 bits plus signif the selected gain is returned (binary encoded in three bits) to the program with thedata. The multirange amplifier allows conversion of signals in the ±10 mV, ±20 mV,±40 mV, ±80 mV, ±160 mV, ±640 mV, and ±5.12V ranges. (See Appendix E for conversionof an analog voltage to its binary equivalent for the amplifier range selected.)The analog-to-digital converter furnishes an overload indication in the data word whenthe signal level falls outside of a range that can be converted.A temperature reference attachment is available for use in the cold junction compensationof thermocouple inputs.The 5014 Analog Input Module Model C 1 is programmed using the prepare I/O and haltI/O commands as described in Chapter 4 under "Input/Output Instruction." Immediateread and immediate write commands transfer data between the analog input module andthe processor module. The setting of modifier field bits in the command further definesthe operation to be performed.In all I/O commands addressed to the analog input module, the device address field isnot used. However, for program compatibility with analog input control model C in a5012 Multifunction Module, the device address field may contain 100100 for all commandsexcept read ID and read DSW. The module address varies depending upon the physicallocation of the I/O module in the 5026 Enclosure.Usually, a complete operation is performed within the time limit required for executionof the immediate commands. Exceptions to this rule are three convert commands that startthe conversion cycle and then permit the program to resume normal operation whileawaiting the interruption request presented by the module at the end of the conversioncycle.11-2 GA34-0003