For communication redundancy, the extension units can be connected in a ring. If there is a disruption or failure, the DEIF
proprietary ring protocol changes the communication path within 100 milliseconds.
The order that the extension units are wired, determines in which order they appear in the software. The controller the extension
units are connected to is always the first unit in the order.
Internal communication restrictions
•
Up to nine extension units can be connected to each other in each network chain or ring.
•
Only
Network chain
or
Network ring
controller configurations are supported.
◦
Do not connect switches or other non-DEIF network equipment as part of the network chain or ring.
•
The Ethernet cables must not be longer than 100 metres, point-to-point.
•
The Ethernet cables must meet or exceed the SF/UTP CAT5e specification.
Hardware changes that do not activate a Fieldbus conflict alarm
The controller logs the following hardware changes. However, they do not activate a
Fieldbus conflict
alarm:
•
A hardware module is replaced by the same type of hardware module, in the same position.
•
Two of the same type of hardware modules swap position.
•
An extension rack is replaced with an extension rack with identical hardware.
Factory settings
The hardware configuration for each controller is created in the factory. If the hardware is changed, the controller activates a
Fieldbus conflict
alarm. The controller hardware configuration must be confirmed in PICUS.
When a new extension rack is connected, the controller always activates a
Fieldbus conflict
alarm. The extension rack hardware
configuration must be confirmed in PICUS.
Topology examples
More information
See
Wiring the communication, DEIF internal communication, Topology examples
in the
Installation instructions
for more information.
13.5 Alternating current module ACM3.1
13.5.1 Alternating current module ACM3.1
The alternating current module measures the voltage and current on one side of a breaker, and the voltage on the other side. The
hardware module responds when the measurements exceed the AC alarm parameters. ACM3.1 uses the AC measurements to
check the synchronisation before the breaker closes.
ACM3.1 provides robust frequency detection in environments with electrical noise. ACM3.1 allows extended measurement
bandwidth up to 40 times the nominal frequency. ACM3.1 includes a configurable 4th current measurement.
Default: ACM3.1 measures 3-phase systems. Optional: Select split-phase (1-phase, 3-wire, for example, L1-N-L2) or single-phase
(1-phase, 2-wire, for example, L1-N).
DESIGNER'S HANDBOOK 4189340911K UK
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