Emerson PaCSystems VersaMax Series User Manual page 80

User Manual
GFK-1503F
Parameters Description
Time Stamp
example:
Exchange
Data Ranges
example:
Ethernet Configuration
A data range that identifies the memory location where the timestamp of the
last data packet will be placed. The timestamp is not an actual date; it is an 8-
byte value representing the time elapsed since midnight, January 1, 1970. The
first four bytes contain a signed integer representing seconds and the next four
bytes contain a signed integer representing nanoseconds. This value
represents the time in the producer when the data sample originated. It can be
examined to determine if a new packet received from the network has a new
data sample or if it is the same data received previously.
The timestamp information produced by the PLC currently has a resolution of
100 microseconds if no network synchronization is used. If NTP is used to
perform network time synchronization, the timestamp information has a
resolution of 1 millisecond and has ±10 millisecond accuracy between PLCs on
the same LAN.
NTP may be enabled in the configuration of the CPUE05. Once NTP time
synchronization is configured, the CPUE05 will synchronize itself to an external
NTP time server if one exists.
This feature is supported IC200CPUE05-HK and previous versions only.)
Offset Reference Low
Point
%R 91
Time
Stamp
A list of 1 to100 data ranges that will be received in the exchange. Data is
received as a contiguous set of bytes. The total size of all combined elements
can be up to
1400 bytes. For consumed exchanges, %S memory types and override
references are not allowed. See Table 4-2 for valid memory types.
Note: If the consumed exchange length does not match that of the produced
exchange, PLC Faults and Ethernet exception entries occur.
The list of data ranges to be received in an exchange specifies:
Offset Reference Low
Point
0.0 %R 100
10.0 %I 257
High Description
Point
94
Time Stamp: Optional place
for the PLC to put the
timestamp.
High Description
Point
104 Conveyor1 in PLC1
264 Conveyor1 limit switch in
PLC1
Chapter 6
Jan 2020
66