在系统程序存储区中存放着相当于计算机操作系统的系统程序。包括监控程序、管理程序、命令解释程序、功能子程序、系统诊断子程序等。由制造厂商将其固化在 EPROM 中，用户不能直接存取。它和硬件一起决定了该 PLC 的性能。除了 I/O 映象区区以外

MAC 6316D-000-PM-59?1DA 150 PSI PNEUMATIC VALVE & PME-59

ASCO RED-HAT 8210G94 1/2″ 150 PSI SOLENOID VALVE, NIB

NUMATICS R50R-08 HIGH FLOW REGULATOR, NO GAUGE, 125 PSI

DWYER A3002 SERIES 3000 27 PSIG HH-117 VAC PHOTOHELIC P

COOPER LIGHTING-LUMARK MHWL-400-MT HIGH PRESSURE SODIUM

DYNAPAR EX6250010024 ENCODER, NNB

INNOVAIR DH100ACDCI 220/240 VAC 4-WIRE IONIZATION AIR D

GUHRING 00257 20,000 APPROX 10-7/8″ OVERALL LENGTH HS T

PULS 5.15V/+12V/-12V RACK MOUNT DC POWER SUPPLY EL-261.

VACCON, ST4 AIR FLOW SILENCER, STRAIGHT-THROUG?H, LOT OF

ALLEN-BRADLEY 800T-N2KF4 SER. T, SELECTOR SWITCH, NIB

JOSLYN CLARK 5U4-76 CONTROL RELAY, COIL: 110-120V 60HZ,

MORSE 329942 SC408 CG SILENT CHAIN 1/2″ PITCH, 2″ WIDE,

NUMATICS, 153SS415N015W61?, PNEUMATIC VALVE, 3/8″ NPT, 1

DWYER 4005C 500 PSIG CAPSUHELIC DIFFERENTIAL PRESSURE G

MARPOSS 1241434020 99UT0429 MANUAL RING GAUGE W/ CASE