GE GFK-2958E, Руководство пользователя

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Chapter 5 Detailed Descriptions of I/O Modules
GFK-2958E RSTi-EP User Manual 120
Process† Data Inputs EP -12F4
Byte Format Name Remark
IB0 Byte Input image 1 Bit0 = DI0 ... Bit3 = DI3, Bit4 ... 7 reserved
IB1
Byte
Running number 1
0 ... 127 rotating
IB2
Word Time stamp 1
0 ... 65535 μs rotating
IB3
IB4
Byte Input image 2
IB5 Byte Running number 2
IB6
Word Time stamp 2
IB7
IB8
Byte Input image 3
IB9 Byte Running number 3
IB10
Word Time stamp 3
IB11
-- -- --
IB56 Byte Input image 15
IB57 Byte Running number 15
IB58
Word Time stamp 15
IB59
† Internal process data mapping with data format “Standard”. Depending on the fieldbus specification and the data
format of the communicating fieldbus components the bytes and/or words can be reversed during data transfer.
5.6.1 Time Stamp Function
With time stamp function (ETS = edge time stamp) enabled, at every corresponding edge the time
value of the timer is stored in the process image as an ETS entry together with the status of the
inputs and a running number.
The module does not use any bytes in the output range. It uses 60 Bytes in the input range for 15 ETS
entries each with 4 bytes.
5.6.2 Structure of an ETS Entry
Input image PII
After the edge transition, the status of the inputs is stored here. The input
byte has the following bit assignments:
Bit 0: DI 0
Bit 1: DI 1
Bit 2: DI 2
Bit 3: DI 3
Bit 4 … 7: reserved (0)
Running Number RN The RN (running number) is a consecutive number from 0 to 127. It
describes the chronological sequence of the edges
Time stamp ETS_US The 16- bit timer (0 ... 65535μs) in the u -remote module is started as soon
as the power supply is switched on and after (216 - 1) μs restarts at 0.