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大致可分为微型机、小型机、中型机及大型机、**大型机。
微型机控制的仅几点、十几点、几十点，如OMRON公司新推出的ZEN机，主机有8点、10点两种，还有扩展，多可扩到34点。再如西门子的logo机，小的也仅能控制10点。还如三菱的alpha机，I/O点数分别有6、10及20等几种规格，而alphaXL的I/O点数分别有14、24两种规格。这些机型，有的还内嵌有简易的编程工具，很便于编程。由于它的价格低廉、使用方便、工作可靠、体积很小…而且，它的可输出电流比其它PLC都大，有的可达8安培。完全可成为新一代相应的继电器控制的替代品，也因此，有的则称其为可编程继电器（PLR）。
Juniper SSG-520-001 SSG Secure Service Gateway GF
Juniper PCG-s M160 IPC3650EAB M40E
Juniper MCS M160 M40E
JUNIPER PB-10C12-ATM-SMIR M40e M160 TESTED WARRANTY
NEW JUNIPER SSG-5-SH-W-US Juniper Secure Services Gatew
Juniper PB-2GE-SX Genuine 2 GE SX MM
JUNIPER NETSCREEN NS-500ES-FE2-AC 2x NS-500-HF2 SECURIT
JUNIPER SRX210H SRX210 gateway w/ 2GE 6FE 1GB
JUNIPER SRX210H SRX210 gateway w/ 2GE 6FE 1GB
Juniper SSG-5-SH-M -Juniper Service Agreement
Includes 2 Year Replacement Warranty
JUNIPER NETSCREEN 5000 MANAGEMENT MODULE NS-5000-MGT
JUNIPER CRAFT-M160-S INTERFACE SP CARD IPC3320
One-day shipping available
Juniper XENPAK-1XGE-ER Intel Branded, Xenpak 10 GE 40KM
1 YR WARRANTY! Ships Today! Tested - Great Condition
One-day shipping available
Juniper Networks WXC-1800-A
Tested in house nice units ready to ship
JUNIPER PCG-M160-S M160/M40E PFE CLK GEN BOARD IPC3650
One-day shipping available
JUNIPER STRM500-A-BSE STRM 500 Base HW Appliance
Juniper M40e-FPC1-EP M40e FPC1 EP NEW OPEN BOX
Juniper M5/M7/M10 4 Port Channelized DS3 PE-4CHDS3
new juniper JXE-1GE-TX-S
JUNIPER SSG-140-SH Secure Services Firewall Gateway
Juniper Netscreen ISG 2000 NS-ISG-SX2 I/O Module NEW
Agilestar - XFP-10G-L-OC192-SR1 - Juniper - New in Box
Agilestar - XFP-10G-L-OC192-SR1 - For Juniper Networks
Juniper Networks PB-1OC12-SON-SMIR 1-port SONET/SDH
Free Ground Shipping
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Juniper Networks Routing Engine 600 RE-600-2048
Juniper Networks Netscreen 8 x GigE Secure Port Module
Juniper 16-port Gigabit Ethernet Universal PIM
New Juniper Branded XFP-10G-S 10GE transceiver 850nm
90 Day Hardware Warranty - Free Shipping!
Juniper M40E-FPC-S Flexible PIC Concentrator M40e M160
90 Day Warranty - Free Shipping
Juniper M40 Router 333/768 RE SCB Dual DC M40BASE-DC
New Surplus Juniper XENPAK-1XGE-SR pluggable 10G Module
90 Day Hardware Warranty - Free Shipping!