PFEA113-20 3BSE028144R0020 ABB Tension electronic controller

PFEA113-20 3BSE028144R0020 ABB Tension electronic controller

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Modbus events are derived from SPA events. With a few exceptions, SPA events

update binary points in the DI and the packed HR area. Simultaneously, a

corresponding Modbus event record is generated. The event record contains the

Modbus DI/CO data point address and the value to which the point has changed (0

or 1). SPA events lacking a corresponding DI/CO data point are shown as SPA

channel and event code (informative event) in the event record. The maximum

capacity of the Modbus event buffer is 99 events. The time stamp of Modbus events

is extended to contain complete information, from date to millisecond.

To read an event record:

1. Write a preset single register command (function 06) to HR671 using a selection

code as data value.

2. Read the selected fault record (function 04) from HR672, register count 8.

Alternatively, a fault record can be read using one command (function 23) only.

Selection code 1: reading the oldest unread record

Status register 3 (HR403) informs whether there are unread event records (see

Fig. 5.1.15.1.-2). If there is one or several unread event records, the master can read

the contents using selection code 1.

The event record contains a sequence number which makes it possible for the master

to determine whether one or several unread event records have been deleted due to

overflow by comparing it to the sequence number of the previously read event

record.

The slave keeps track of which event record is currently the oldest unread. The

master can continue reading event records for as long as Status register 3 indicates

that there are unread records.

* Special case 1: If there are no unread event records, the contents of the last read

record is returned. If the buffer is empty, however, the registers contain only

zeros. This is the only time when sequence number zero appears.

* Special case 2: If the master tries to read the next unread event record without

entering selection code 1 again, the contents of the last read record is returned.