除了 I/O 映象区区以外 系统 RAM 存储区还包括 PLC 内部各类软设备(逻辑线圈 计时器 计数器 数据寄存器和累加器等)的存储区 该存储区又分为具有失电保持的存储区域和无失电保持的存储区域 前者在 PLC 断电时 由内部的锂电池供电数据不会遗失 后者当 PLC 断电时 数据被清零为了消除二者之间由于运行方式不同而造成的差异 考虑到继电器控制装置

ALLEN BRADLEY POWER SUPPLY MODULE 5120-P1 96129272 SERI

HONEYWELL T678A 1445, REMOTE BULB TEMPERATURE CONTROLLE

NUMATICS 081SS500M000061 DOUBLE DIRECT SOLENOID VALVE,

PARKER 987773 DIRECTIONAL CONTROL ROLLER VALVE

APPLETON VPA1075G STYLEMASTER ENCLOSED AND GASKETED INC

RELIANCE ELECTRIC 14C110 MINIPACK PLUS VS DRIVE

ALLEN BRADLEY 135775 15-50HP CAPACITOR, NIB

FANUC EE-3505-586-001 RJ3 PAINT CNTRL 7+3 BRAKE HARN WI

ALLEN BRADLEY 1494V-DS30 FUSIBLE DISCONNECT SWITCH KIT,

WTC TB96-P01A DATA ENTRY PANEL, REPAIRED

THOMSON 8107-448-017 BALL BEARING SCREW,

NCGE 90 DEGREE FITTING CABLE & CORD LOT OF 28 IN BA

ANTUNES HLGP-D HIGH LOW GAS RESET SWITCH, NNB

SIEMENS SIMATIC S7 ANALOG OUTPUT MODULE 6ES7 135-4GB00-

ALLEN BRADLEY 42GDF-9004-QD8 PHOTOSWITCH LOT OF 4 NNB

BANNER 25545 POWER BLOCKS WIRING BASE NIB