为了完成控制策略，为了替代继电器，使用户等完成类似继电器线路的控制系统梯形图，而编制了一套控制算法功能块(或子程序)，称为指令系统，固化在存贮器ROM中，用户在编制应用程序时可以调用。指令系统大致可以分为两类，即基本指令和扩展指令。细分一般PLC的指令系统有:基本指令、定时器/计数器指令、移位指令、传送指令、比较指令、转换指令、BCD运算指令、二进制运算指令、增量/减量指令、逻辑运算指令、特殊运算指令等，这些指令多是类似汇编语言。另外PLC还提高了充足的计时器、计数器、内部继电器、寄存器及存贮区等内部资源，为编程带来极大方便。
SIEMENS SERVO MOTOR 1FK7063-5AH71-1TH2
FANUC CONTROLLER CARD A20BA
YASKAWA ELECTRIC CARD JANCD-MMM02
OMRON UNIT C200H-AD003
SIEMENS SERVO MOTOR 1FK7032-5AK71-1GB0
INDRAMAT PERMANENT MAGNET MOTOR MAC115D-0-CS-4-C/130-A-0/WI520LX/S01
FANUC AC SERVO MOTOR A06B-0235-B605
ALLEN BRADLEY SERVO MOTOR 1326AB-A1G-11
FANUC DRIVE A03B-0815-C001
FANUC DC SERVO MOTOR A06B-0632-B011
FANUC CONTROLLER CARD A16BD
SIEMENS SERVO MOTOR 1FT6102-1AC71-4AH1
FANUC SERVO DRIVE A06B-6079-H207
ALLEN BRADLEY DRIVE 1336-C020-EOE-L3
MOOG BRUSHLESS SERVO MOTOR
SIEMENS SERVO MOTOR 1FK7040-5AK71-1SA0
YASKAWA CPS-420F POWER SUPPLY
BALLUFF ENCODER BDG /
HEIDENHAIN ENCODER ROD 320.
SIEMENS DRIVE 6SN1123-1AA00-00A0
SIEMENS SERVO MOTOR 1FK7103-5AF71-1AH5
COMPUTER CPU FOR PARTS,
HOFFMAN FAN A-4AXFN
KEYENCE DRIVE CA-U2
KUKA SERVO MOTOR 1FK6100-8AF91-1ZZ9-Z S09
ALLEN BRADLEY PROCESSOR UNIT *AS IT IS* 1747-L541
YASKAWA POWER SUPPLY CPS-18FB
ALLEN BRADLEY DRIVE 1336-B020-EAE-FA2
SIEMENS BRUSHLESS SERVO MOTOR 1FT6084-8AC71-1EG1
ALLEN BRADLEY SMC FLEX DRIVE 150-F85NCDD SER B
FANUC AC SPINDLE MOTOR A06B-0759-B201#3000
YASKAWA AC SERVO MOTOR USAGED-30A22K
OKUMA DRIVE (200 A)
SIEMENS SERVOMOTOR 1FK7022-5AK71-1LH3-Z
YASKAWA SERVOMOTOR SGMGH-13A2A-YR23
DELTA TAU DATA SYSTEMS MODULE ACC34AA
SIEMENS SERVO MOTOR 1FK7100-5AF71-1TH2
SIEMENS SERVO MOTOR 1FT6064-1AH71-2EH1
EATON CORPORATION DRIVE AF95AG0C040VLL8 REPAIR SERVICE
ALLEN BRADLEY 1398-DDM-030 Servo Drive
ALLEN BRADLEY DRIVE 1336VT-B050-EAS REPAIR SERVICE
MITSUBISHI DC PERMANENT MAGNET DC SERVO MOTOR HD 81-12S
FANUC POWER SUPPLY BOARD A16BE