可编程逻辑控制器系统的通信网络中，上级的网络通信速率应大于1Mbps，通信负荷不大于60%。可编程逻辑控制器系统的通信网络主要形式有下列几种形式：
1）、PC为主站，多台同型号可编程逻辑控制器为从站，组成简易可编程逻辑控制器网络；
2）、1台可编程逻辑控制器为主站，其他同型号可编程逻辑控制器为从站，构成主从式可编程逻辑控制器网络；
3）、可编程逻辑控制器网络通过特定网络接口连接到大型DCS中作为DCS的子网；
4）、专用可编程逻辑控制器网络（各厂商的专用可编程逻辑控制器通信网络）。
为减轻CPU通信任务，根据网络组成的实际需要，应选择具有不同通信功能的（如点对点、现场总线、）通信处理器。
Allen-Bradley CC-236 Coil CC236
Allen-Bradley AB 1771-IAD Series D Input Module w/Instruction Manual
ALLEN-BRADLEY 872C-D2NP8-D4 SENSOR
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Allen-Bradley 1794-TBNF * Series A
ALLEN-BRADLEY 1747-M4 SLC500 UVPROM MEMORY MODULE
ALLEN-BRADLEY 1747-CP3 CABLE- NO BOX
ALLEN-BRADLEY 1720-L520 or 1720L520 (SERIE C) OFF-RETURN MEMORY
ALLEN BRADLEY Z-34039 CONTACT KIT SIZE 2 1 POLE
ALLEN BRADLEY Z-26693 OPERATING HEAD W LEVER, IN BOX
Allen Bradley X pneumatic timing relay solenoid complete less coil
ALLEN BRADLEY TC473 COIL
Allen Bradley Sq Pilot Light 800MB-CQ24G 800MBCQ24G
Allen Bradley SP /A Surge Suppressor 1200V 0.22μF 5 Ohm
ALLEN BRADLEY SLC 500 PROCESSOR UNIT 1747-L514 SER B FRN4b
ALLEN BRADLEY RED ILLUMINATED PUSH BUTTON 800T-FXTQ24 A1
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ALLEN BRADLEY PROXIMITY SENSOR 10-48VDC 875C-M10NP30-D4
ALLEN BRADLEY PILOT LIGHT 800HL-QP10 800HLQP10 SER C
Allen Bradley Photoswitch 42SR2-4001L Series B with 20 ft (6.1 m) Cable
Allen Bradley Photoswitch 42KL-F2TCL-G3 Ser A
ALLEN BRADLEY PARTS FOR CAT. NUMBER 1494F-L2
ALLEN BRADLEY OVERLOAD RELAY BLOCK IN BOX 592-KOV16
Allen Bradley Overload Relay - 193-A2F1 Series A
ALLEN BRADLEY MCS MINI CONTACTOR 24VDC # 100-K12ZJ10
ALLEN BRADLEY MANUAL MOTOR STARTER 140-MN-0100
