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

The 5014 Analog Input Module Model B1 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 DESCRIPTIONIn addition to logic controls, the model B1 I/O module consists of an analog-to-digitalconverter (ADC), an amplifier, and a point-select relay multiplexer capable of a maximumscanning speed of 200 points per second. As many as 128 two-wire differential analoginput points can be accommodated, in eight groups of 16 points each.One amplifier is required to service all of the analog input points. If all analog inputs areat the ±5.12V level, the high-level amplifier is used. If a range of voltage levels must beaccommodated, a multirange amplifier is used.The multirange amplifier can be program controlled to one of seven different ranges, orto automatically select the appropriate amplifier gain. When the amplifier is programmedto automatically select the gain, analog signal resolution is reduced to 12 bits plus sign ifthe selected gain is returned (binary encoded in three bits) to the program with the data.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 conversion of ananalog voltage to its binary equivalent for the amplifier range selected.)The analog-to-digital converter furnishes an overload indication in the data word when• the 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 Model E2 provides the capacity to expand a Model B1 an additional 128points, divided into eight 16-point groups. Two Model E2 modules may be attached toeach Model Bl. The first Model E2 module must be located directly under the Model Bl.The second Model E2 module, if any, must be located directly under the first Model E2module. Points in the Model E2 module are addressed through the Model B1 module.I/O COMMANDSThe 5014 Analog Input Module Model B1 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 is notused. However, for program compatibility with analog input control model B in a 5012Multifunction 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 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."10-2 GA34-0003II 1 1111 1