ABB ACH 400, Руководство пользователя

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Chapter 1 – Introduction
ACS/ACH 400 Direct N2 Bus Interface 1-3
Binary Outputs
Binary Output points are boolean values which
are outputs from the Metasys. In the ACH 400
drive, the binary outputs include the drive
control for start and stop, direction, and fault
reset.
Change of State (COS)
On the N2 Bus it is possible to define High and
Low Warning and Alarm limits to analog input
points, and alarm states for binary Inputs.
When a point goes to a Warning or Alarm state,
or returns back from it, the drive will report this
change of state back to the Metasys. This
Change of State (COS) is reported only if this
function is required by the Metasys. This
feature allows fast recognition of changes to
non-normal states, and the subsequent returns
back to normal.
N1LAN
N1LAN is the communications backbone for
Metasys. It allows the functions of multiple
Network Control Units and Operator
Workstations to be integrated into a facility-wide
control and information network.
N2Bus
The N2 Bus connects point interfaces and
remote controllers within an equipment room, or
within occupied spaces of your facility, to
Network Control Units (NCUs).
On-Line / Off-Line
On the N2 Bus, a node can be either On-Line or
Off-Line. Immediately after the power-up, every
station is in the Off-Line state. The Metasys
system will then poll all the Off-Line stations.
Once the ACS/ACH 400 has properly
responded to this poll, it is placed into the On-
Line state. In this state the Analog and Binary
points can be read and modified.
When the drive does not respond to the
Metasys for three polls in a row, the drive is
placed into the Off-Line state by the Metasys.