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

' 1111111..1 , ' MEINDIGITAL OUTPUT CONTROLThe Digital Output Control feature of the multifunction module can accommodate asmany as 64 isolated and/or non-isolated digital output points, in four groups of 16 pointseach. Each group can be configured to use one of the three optional digital output circuittypes available (low-power group, medium-power group, and contact group). A non-isolateddigital output group provides 16 medium-power, solid-state switches for switching up to52.8V dc and 450 ma. of user-supplied power.The digital output points can be operated by either of two methods: (1) data can besent directly to a selected digital output group register which, in turn, operates theoutput points; or (2) data can be sent to the holding register and then read back andchecked for accuracy before transferring it to one of four digital output group registers.Digital output circuits are compatible with digital input circuits, which permitsmultiplexing of digital output points with the user's contacts for digital input sensingapplications. Either positive or negative voltage sources can be used through properselection of the input terminals when the digital output medium-power group or digitaloutput contact group is used. This circuit compatibility also permits direct connectionof digital input points to digital output points for testing of the input/output circuits.I/O CommandsData transfers between the digital output function and the processor are accomplished byimmediate read and immediate write commands. The setting of the modifier field bits in thecommand further defines the operation to be performed.All read and write I/O commands addressed to the digital output control must use oneof the following device addresses in order to address the corresponding digital outputgroup separately:Device Address Digital Output Group110000 0110100 1111000 2111100 3The module address in the I/O command varies depending upon the physical location of themultifunction module in the 5026 Enclosure.The normal digital output programming routine is shown in Figure F-5 of "Appendix F."Write Digital Output Group Register0 5 8 11 16 20 26 31Op code R Fun Zeros Mod DA MA0 0 0 0 1 XXX 0 0 1 0 0 0 0 0 0 0 0 0 1 1 XX 0 0 XXXXXX1 i i I I i II Ili! 1 1 1 1 1 1 1 1 1 1 1 1 1',mom\ emu./ ••■■••,,eaas., "•■••••■,■••••' ••■•••■,,■•■■•• ••■••■•.„,...m."0 8-F 2 0 0 C-F 0-3This command stores 16 bits of output data from the index register (R), or the accumulatorif R=000, into the digital output group register identified by the device address field.The status of the 16-bit digital output register is reproduced at the corresponding terminalsfor its associated 16-point group. A 1-bit in the register produces a closed or oncondition at its corresponding output point; a 0-bit in the register produces an open oroff condition at its corresponding output point.IBM 5012 Multifunction Module Model Al 13-21