正如PLC扫描顺序所示,扫描中包括多项。这些项目在整个扫描中所占时间如表2-1和表2-2所示。扫描时间计算表2-1列出了PLC扫描时间的7个分项。扫描时间由固定时间(系统管理与诊断和可变时间组成。可变时间随V0配置、用户程序容量与PLC相连接的编程设备类型的变化而变化。
IRCON MODLINE R99F05 TWO COLOR PYROMETER INFRARED
BENTLY NEVADA 81546-01 SIGNAL INPUT RELAY CARD
2 P&H HARNISCHFEGER 79U16D2 OFF POSTITION BIAS MODULE
UNITED CONTROLS 55 SERIES BRISKHEAT TEMPERATURE CONTROL
ADEPT XY-HRS ACTUATOR
FOXBORO DM400TR-0B
ABB ASEA 2668 ISY-AK 180-134/1
TODD T-164-2415R POWER SUPPLY
SQUARE D MXDO-1 DC CONTACTOR 600V
SQUARE D MXDO-3 DC CONTACTOR 600V
HEAVY DUTY CRANE MILL DC CONTACTOR
SQUARE D TW120-D 6715 TAB WELD PLATE RESISTOR
FOXBORO 870PH-70XA ELECTRONIC TRANSMITTER
FOXBORO 863DP-M2D2CC INTELLIGENT TRANSMITTER
FOXBORO 863DP-M2D2SS INTELLIGENT TRANSMITTER
HYTORK-425 PNEUMATIC ACTUATOR 120PSIG 182BAR
PROLOG PL RS-422 PWB110802-001 CPU CARD
PROLOG PL TTL7508 PWB111469-003 I/O CARD
1581.5237 CIRCUIT BOARD
1581.5251 CIRCUIT BOARD
1581.5184 CIRCUIT BOARD