YOKOGAWA N-IO field enclosure (System Models: A2ZN70D, A2ZN60D)

• GENERAL

This General Specifications (GS) covers the hardware specifications of an N-IO field enclosure and its related

products (A2NN70D style S2. A2NN60D style S2. A2CB60 style S2. and A2CX100). The N-IO field enclosure

(A2NN70D) [System model (*1): A2ZN70D] is a standardized remote I/O enclosure for outdoor use, which provides

the accessories including field power supply units with optimized design. The N-IO field enclosure consists of two

components, one is a dedicated enclosure with terminal blocks and the other is a base unit with an N-IO node

including field power supply units. It is possible to order the enclosure (A2CB60) and the base unit (A2NN60D)

[System model (*1): A2ZN60D] individually. In the individual orders, the base unit can be shipped separately from

the enclosure. Then this enables the user to install the base unit into the enclosure at a suitable timing. This is

defined as “Flexible installation”. The flexible installation allows a project to perform the acceptance test using the

base unit at factory in parallel with field wiring work to the enclosure at the customer site. And the flexible installation

minimizes the exposure of the base unit to the harsh environment such as dust, water, and electromagnetic noise

by keeping the base unit in the warehouse during field wiring work to the enclosure.

• Flexible installation

Base units can be shipped separately from the enclosure and installed into the enclosure at a suitable timing. This

allows a project to perform the acceptance test using the base unit at factory in parallel with field wiring work to the

enclosure at the customer site. And this minimizes the exposure of the base unit to the harsh environment such as

dust, water, and electromagnetic noise by keeping the base unit in the warehouse during field wiring work to the

enclosure.

• N-ESB / Optical ESB bus interface function

This function allows for communicating with the upper-level field control unit and N-IO node. It also allows for

communicating with the lower-level N-IO node.

Uplink:

Downlink:

1 port /N-ESB bus module (N-ESB bus or optical ESB bus)

1 port /N-ESB bus module (N-ESB bus or optical ESB bus)

• Splicing box

This is installed in the enclosure as standard. Connect the optical fiber cable of the optical ESB bus from outside to

the splicing box.

• House keeping (HK) function

Monitors the temperature in the enclosure, the system power and field power output.

• Maintenance function

The node interface unit (NIU) has a Micro-USB maintenance port for maintenance.

The setting of the node address is possible with a NIU Node Number Setting tool.

NIU Node Number Setting Tool is included in the CENTUM VP R6 software media.