ProSoft Technology InRax MVI71-DNPSNET, User Manual

Page: 57 / 100

Reference MVI71-DNPSNET ♦ PLC Platform
Distributed Network Protocol Interface Module
ProSoft Technology, Inc. Page 57 of 100
September 22, 2008
Up to 10 events can be passed from the PLC to the module in each block. To
ensure that the block reached the module and was processed, the module will
send a response read block 9959 to the PLC. The format of the block is shown in
the following table.
Word Offset in
Block
Data Field(s) Description
0 Block ID Identification code for block set to 9959.
1 Block ID Block identification code for request from PLC by the
module.
2 Event Count This field contains the number of events processed by the
module.
3 Sequence Counter This field contains the sequence counter of the last
successful block 9959 received.
4 to 63 Spare Not used
The sequence counter field in the returned block is set to the last successfully
processed block 9959 from the PLC. Compare this value to that sent by the PLC.
If the values match, the events can be removed from the PLC. If the values do
not match, or the PLC does not receive a 9959 block, the PLC must re-send the
block.
Block 9970 or 270 - Set PLC Time Using Module Time
This block transfers the module's time to the PLC processor. Ladder logic must
be used to set the processor's clock using the data received. The format of the
block sent from the PLC has the following format:
Word Offset in Block Data Field(s) Description
0 Block ID This field contains the value of 9970 identifying
the block type to the module.
1 to 63 Not Used Not Used
The module responds to the request with a read block 9970 with the following
format:
Word Offset in Block Data Field(s) Description
0 Block Read ID This field contains the block identification code of
9970 for the block.
1 Block Write ID This is the next block requested by the module.
2 Year This field contains the four-digit year to be used
with the new time value.
3 Month This field contains the month value for the new
time. Valid entry for this field is in the range of 1
to 12.
4 Day This field contains the day value for the new time.
Valid entry for this field is in the range of 1 to 31.
5 Hour This field contains the hour value for the new
time. Valid entry for this field is in the range of 0
to 23.
6 Minute This field contains the minute value for the new
time. Valid entry for this field is in the range of 0
to 59.