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ABB Bailey INNIS01 Network Interface Slave Module

September 05,2024

ABB Bailey INNIS01 Network Interface Slave Module

The INNIS01 Network Interface Slave Module (NIS) and the INNPM11 Network Processing Module (NPM) make up a process control unit interface. This process control unit interfaceprovides control modules in a process control unit with accessto an INFI-NET® communication system.


The NIS module is an I/O module that works in conjunctionwith the NPM module. This allows a node to communicate withany other node on the INFI-NET loop.

The NIS module is a single printed circuit board that occupiesone slot in the module mounting unit.

The circuit board contains microprocessor based communication circuitry thatenables it to interface with the NPM module.

Two latching screws on the faceplate secure the NIS module tothe module mounting unit.

There are 16 LEDs on the faceplatethat display error codes and event/error counts.

The NIS module has three card edge connectors for externalsignals and power (P1, P2 and P3).

Connector P1 connects tothe module power source.

Connector P2 connects the NIS module to the I/O expander bus to communicate with the NPMmodule.

Serial communication to other nodes is through connector P3 using a cable connected to a termination unit or termination module.

Communication between nodes is throughcoaxial or twinaxial cables that connect the termination unitsor modules on each node.



DESCRIPTION AND OPERATION

The NIS module increments the circulation count field of allincoming messages. When a message count field exceeds 255,the message is discarded. This is useful in keeping retry andspurious message traffic to a minimum. The NIS module usesthe message type to determine how to process the message.The checksum and cyclic redundancy check code fields verifydata integrity.

Any NIS module can transmit a message at any time withoutregard to the activities of any other NIS module on the system.Each NIS module can transmit and receive messages simultaneously. NIS start-up/shutdown is local and requires no interaction with other NIS modules on the INFI-NET loop. Each NISmodule receives all incoming messages and transmits a newstream of messages in a store and forward fashion to the nextnode. When there are no messages for the NIS module to transmit, the NIS module transmits flag characters (null packets) asthe loop synchronizing condition to keep the receivers in lock.


Data Integrity

NODE STATUS TABLE
The NIS module maintains an internal table of system widenode status such as off-line and busy. The NIS module relaysnode status changes to the NPM module. When the NIS moduleperiodically polls nodes, it updates this table accordingly.

POLLING
The NIS module uses the information in its status table forpolling purposes. As it scans the status table, it picks out destinations targeted for multicast messages that have beenmarked off-line or busy. After polling the destination, the NISmodule updates its table and forwards pertinent information tothe NPM module.


Dipswitch SW3 pole one determines network processing module compatibility. Set pole one to zero for a process control unitinterface. Pole two enables or disables ROM checksumming.Elsag Bailey recommends that the NIS module be installedwith checksumming enabled to take full advantage of theon-board diagnostics. Pole three enables internal testing whichmust be disabled for normal operation. Pole four, in conjunction with pole three, makes the node appear to be busy to othernodes. This condition is used by Elsag Bailey personnel only.Pole five enables the loop idle condition display for the frontpanel LEDs. If loop one is idle, the group A LEDs will flash onand off about twice per second. If loop two is idle, the group BLEDs will flash. The loop idle display is intended to serve as awarning that a loop integrity problem exists. Pole six enablesdiagnostic tests that preclude normal NIS module operation.Poles seven and eight

determine loop speed and loop mode.



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