描述
要先弄清除控制系统的I/O总点数，再按实际所需总点数的15～20％留出备用量（为系统的改造等留有余地）后确定所需PLC的点数。
PLC的输出点可分为共点式、分组式和隔离式几种接法。隔离式的各组输出点之间可以采用不同的电压种类和电压等级，但这种PLC平均每点的价格较高。如果输出信号之间不需要隔离，则应选择前两种输出方式的PLC
One-day shipping available
Allen Bradley 1770-FE PLC 3 Keyboard NEW
NEW ALLEN BRADLEY 5150-RS2 REMOTE I/O SCANNER MODULE
1 NIB ALLEN BRADLEY 1791OA32 32 POINT I/O BLOCK MODULE
Allen-Bradley MOX830-24-Q3515 TB DC Power Supply NIB
ALLEN BRADLEY AC SERVO MOTOR 1326AB-A1G-11, 122285
ALLEN BRADLEY AC SERVO MOTOR 1326AB-B520E-21-K5L
Allen Bradley 1747-L553 Series C 5/05 Ethernet SLC 500
One-day shipping available
Allen Bradley 1771 PLC 5/20 12 slot rack /w I/O modules
1 NEW ALLEN BRADLEY 2706-P42R MESSAGE DISPLAY NIB
Allen Bradley, ControlLogix, ProSoft MVI56-MCM, Nice!
ALLEN BRADLEY PANELVIEW 2711-K10G20 2711K10G20 ETHERNET
One-day shipping available
