Central Module PLC/CPU 928B   The central module CPU 928B is used for fast binary and word processing as well as for the organisation of the entire cyclical process image and communication.

Performance features Program compatibility due to execution of STEP®5 from Siemens instruction set Increased plant power by employing fast signal processing Cost reductions by using conventional S5 from Siemens memory modules Easy handling due to common and approved interfaces (AS511, 3964(R)) Short configuration time using standard function blocks Easy maintenance due to status indication LED on front panel High operating safety Simple integration into communication tasks, by configuring second interface (for example 3964(R)) Reduced space requirements due to slim design   Fields of application The central module 928B is used as: CPU within the 135U and 155U As well as within the central rack 188   Configuration Arithmetic unit with 33-bit processor for fast processing of binary and word instructions Microprocessor (16-bit) for processing the operating program of the module as well as the serial interfaces (3964(R)) Memory (RAM) for flag, S-flag, timers, counters, process image etc. Internal memory (RAM) for 46 Kbyte data of the user program Slot for memory module (64 kByte) PU-interface (15 pin Cannon jack) Hardware clock Operating system for cycle, time and process-controlled processing and error handling Special functions for cycle statistics   Versions Configuring VIPA 928-3UB21 using memory Flash card 374

Technical data     Microprocessors   68EC040 (32-bit)     68340 (16-bit) Memory Space Requirements RAM internal (only data modules) 46 kByte   RAM internal (all modules) 64 kByte Processing time for 1k binary instruction 1msec   1k word instruction 1msec Cycle time-out Circuit per program: adjustable   pre-adjustment 200msec   Flag 2048   S-flag 8192 Timing Circuits Number of circuits 256   Time range 0.01…9990sec Counter Number of counters 256   Counter range 0…999 Inputs digital max 1024 with process image   additional max 3072 w/o process image   analog max. 192 Outputs digital max 1024 with process image   additional max 3072 w/o process image   analog max 192 Program Processing cycle (OB1, FB0)     alarm controlled     timer controlled in 9 cycles     clock controlled   Current Consumption (at 5V) CPU928B typ. 1.8A   Memory module typ. 0.1A   Power loss max. 10W Space requirements   1 slot

Ordering information     Description   Order number: CPU928B with slot for 1 mem. Mod.   VIPA 928-3UB12 Memory module 376 (EPROM) - 16 kByte VIPA 376-0AA11   - 32 kByte VIPA 376-0AA21   - 64 kByte VIPA 376-0AA31 CPU 928B with slot for 1 PCMCIA mem. Mod.   VIPA 928-3UB21 Memory module 374 (Flash ROM) - 256 kByte VIPA 374-2KH21 Programming software   VIPA MC5-KS83