SOE - Infi 90 Series INSEM01 | ABB - DCS Center

Description and Operation

Introduction

The Distributed Sequence of Events (SOE) provides the opera tor with an ordered sequence of state change events associated with up to 1,500 digital inputs with one millisecond resolution.

Digital input transitions are collected and time-stamped by I/O modules (IMSED01 and IMSET01). Noise and false transi tions are filtered. Then event data is acquired by the associated controller by means of two dedicated function codes (241 and 242) and made available to the INSEM01 module.

The INSEM01 module collects and sorts the data coming from different Harmony control units (HCU). The INSEM01 module also processes all event data and makes it available for display on a human system interface when a trigger condition is met.

The INTKM01 module manages sequence of event time. The INTKM01 module receives time information in IRIG-B format from an external satellite receiver and makes it available to the system through a dedicated time-synchronization link. The time-sync link connects the INTKM01 module and all the IMSET01 modules in the system. The connection to the time-sync link is achieved by a NTST01 unit.

INSEM01 Module

The INSEM01 module communicates directly with the INNIS01 module and the INTKM01 module over the I/O expander bus. The INSEM01 module manages the following events:

• 1,500 points coming from the SOE I/O modules in up to 1,000 Harmony control units. 

 • 256 complex triggers with 16 operands each. 

 • 3,000 simple triggers.

The INSEM01 module consists of one printed circuit board and occupies one mounting unit slot adjacent to its associated INNIS01 module and INTKM01 module.

Two captive latches on the INSEM01 faceplate secure the mod ule in the mounting unit. The faceplate contains 17 LEDs and a stop/reset switch.

INSEM01 module is configured by means of function codes 243, 244, 245 and 246 for the SOE parameters. INSEM01 module monitors the HCU nodes for data on an exception report basis, collects and sorts data acquired and provides sequence of events data to the human interface system for report presentation on a detection of a trigger condition.

INTKM01 Module

The INTKM01 module sends its internal time information to the INSEM01 module via the I/O expander bus and through the time-sync link via the NTST01 unit. The INTKM01 module can be connected to an external receiver using the IRIG-B time code link. The INTKM01 module uses the time information sent by the receiver to initialize and correct its time information. INTKM01 Installation in Section 3 describes the configuration needed for the Truetime Satellite Receiver model SRS.

Functions

The INTKM01 module performs the following functions:

 • Sends time information on the time-sync link every second. 

 • Makes available the time information in the absolute time format on the I/O expander bus for the INSEM01 module. 

 • Updates its internal clock and maintains its synchroniza tion with the time information provided by the external receiver.

The time information is transmitted every second from INTKM01 module on the time-sync link at 62.5 kilohertz. The time information is composed of the time information and the synchro pulse. The time information contains the number of milliseconds elapsed since 0:00 March 1, 1980, and is relative to the rising edge of the synchro pulse.

The absolute time is written every millisecond from the INTKM01 module on its I/O expander bus internal output buffer (FIFO out), in this way the absolute time is always avail able for the INSEM01 module.

The time information is received by the INTKM01 module from the NTST01 unit by an IRIG-B interface. The INTKM01 module cyclically updates and adjusts the internal time using this time information.

After power-on the internal time is initialized with the absolute time provided by the INSEM01 module and the time informa tion from the receiver. The absolute time is used to calculate the current year because the time information from the receiver does not contain this information. If the receiver is not present or does not supply the time information, the internal time is initialized with the absolute time from the time-sync master.

Updating Internal Clock

After the initialization the internal time information is adjusted with the time information provided by the receiver. If the receiver is absent the internal time information is not adjusted, and the precision of the time information generated by the INTKM01 module depends on the drift of the internal quartz oscillator.

The internal accuracy is set high if the INTKM01 module is synchronized by the receiver and low if the INTKM01 module runs with its internal quartz oscillator. Every one second the time information is transmitted from the receiver and the INTKM01 module uses this information to control and correct its internal clock.

Accuracy

The resolution of time information sent on the time-sync link is ±10 microseconds. The resolution of time information to the INSEM01 module is ±1 millisecond.

Block Diagram

INTKM01 module operations are controlled by the processor (Fig. 2-1). The module contains devices for the management of I/O for the external receiver and the I/O expander bus (I/O expander bus control, IRIG-B interface) and of the auxiliary computer devices (boot EPROM, RAM, machine fault timer, FIFO in and FIFO out, and time information interface).