Melec C-VX875, Instruction Manual, Page: 29 / 32

- 29 -
C-VX875
Instructions Manual
4‑4. Connection of AL‑Ⅱ communication system
Operation not anticipated may cause damage of the machine and the product.
To prevent the malfunction by the noise, the AL‑Ⅱ I/O communications cable
QAUTION 
recommends recommended cable.
(1) Core connection of AL‑Ⅱ I/O communications cable
Please install the core in the master side. And, the personal computer system including the AL‑Ⅱ
I/O communication is made to operated with stability.
The core is prepared by our company.
Please refer to the "connection/other" manual.
(2)Connection of terminator
C‑VX875 mounts the terminator of the AL‑Ⅱ I/O communication, is connected, and the setting is
unnecessary. It is necessary to install C‑VX875 to the AL‑Ⅱ I/O communication network edge.
Connect terminator (CB‑54/R) with the slave I/O unit arranged on the AL‑Ⅱ I/O communication
network edge.
Do not connect the terminator with other equipment.
AL‑Ⅱ communication network Terminator
Core
CB‑54/R
C‑VX875 2CB‑01v1/ 2CB‑01v1/ 2CB‑02v1/
(Master) 3232‑MIL etc. 3232‑MIL etc. 1616‑MIL etc.
Terminator Terminator Terminator Terminator
Always on(Inside) Unconnection Unconnection Connection
(3) Wiring distance of AL‑Ⅱ communication
The total wiring distance of the AL‑Ⅱ I/O communications cable is the following range including
the multidrop wiring.
・The wiring distance of Extend I/O doesn't relate to AL‑Ⅱ I/O communication baud rate (RATE).
・The wiring distance of Extend I/O from each slave is within 1 m.
L1 / RATE
(Multi drop) Terminator
Terminator(Build‑in)
Address Address Address (Slave unit) Address Address
=0 =1 =2 =3 =4
L2
(C‑VX875)
(Extend I/O) (Extend I/O) (Extend I/O) (Extend I/O)
●AL‑Ⅱ communication baud rate and wiring distance
RATE
Wiring distance 10 Mbps 20 Mbps
L1 (AL‑Ⅱ I/O communication) 50 m or less 30 m or less
L2 (Extend I/O communication) 1 m or less
●The number of slaves that can be connected directly with the AL‑Ⅱ I/O communication
are 4 units or less. Extend I/O that can be extended directly from the slave unit is not
included in the number of slaves.
(4) Power supply and slave power supply for communication
The AL‑Ⅱ I/O communication power supply of each slave I/O unit is supplied from C‑VX875 through
the communications cable so that the entire AL‑Ⅱ I/O communication network should not become
unstable when the power supply on each slave unit side is intercepted.
The reconnection of communications can be done by executing Environment‑Function to the master when
the power supply of the main unit on the slave I/O unit side is obstructed.
C-VX875 side
(Personal computer side )
Core: ZCAT2032 - 0930
The core is fixed with INSULOK .
Installs it within 40 mm .