正如PLC掃描順序所示,掃描中包括多項。這些項目在整個掃描中所占時間如表2-1和表2-2所示。掃描時間計算表2-1列出了PLC掃描時間的7個分項。掃描時間由固定時間(系統(tǒng)管理與診斷和可變時間組成。可變時間隨V0配置、用戶程序容量與PLC相連接的編程設(shè)備類型的變化而變化。

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