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

1411111111,1111111111n 111The 5014 Analog Input Module Model D1 converts analog signals into binary values of 14bits plus sign. Reed relays with a common-mode voltage up to 100V, or mercury relayswith a common-mode voltage up to 250V can be used.The model D1 analog input module can be located in any or all of the I/O modulepositions within an IBM 5026 enclosure. (Location 00 in the 5026 is the processormodule location.) The 5014 Model El provides the capacity to expand a Model DI anadditional 128 points, in eight groups of 16 points each. Two model El modules may beattached to each model Dl. The first model El module must be located directly belowthe model D1; the second model El must be directly below the first. The model El isaddressed through the model Dl.FUNCTIONAL DESCRIPTIONIn addition to logic controls, the model D1 I/O module consists of an analog-to-digitalconverter (ADC), an amplifier, and a point-select relay multiplexer capable of a maximumscanning speed of 100 points per second. As many as 128 two-wire differential analoginput points can be accommodated, in eight groups of 16 each.One amplifier is required to service all of the analog input points. If mercury relays areused and all analog inputs are at the ±5.12V level, the high-level amplifier is used. If arange of voltage levels must be accommodated, a multirange amplifier is used.The multirange amplifier must be program controlled to one of seven different ranges.Analog signals to be converted can be within the range of —5.12V to +5.12V when usingmercury relays. When using reed relays, the range is -0.64V to +5.12V. (See Appendix Efor conversion of an analog voltage to its binary equivalent for the amplifier rangeselected.)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.I/O COMMANDSThe 5014 Analog Input Module Model D1 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 the modifier field bits in the command furtherdefines the operation to be performed.In all I/O commands addressed to the analog input module, the device address field isnot used. The module address varies depending upon the physical location of the I/Omodule 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 two 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.Executing either of the two convert commands sets on the ISW device-busy bit, whichremains on during the conversion time. When the conversion is complete, an interruptionrequest is presented to the processor, the device-busy bit is turned off, and the device-endbit is turned on. Condition code 2 is returned to all immediate commands issued (exceptread ISW or read DSW) while the module is busy or has a pending interruption.The normal analog input programming routine is shown in Figure F-1 of "Appendix F."12-2 GA34-0003