Unsolicited Messages

For detailed information about the Unsolicited Message format, see the TCP/IP Ethernet Communications for the Series 90-70 Programmable Controller (GFK-1004).

The following is an example of a COMREQ Function Block and a COMREQ Command Block that will:

• Establish a channel (channel 7 in this example) to a remote Host application server at IP address 192.168.0.4.
• Return the Communication Request Status (CRS) word to %R10.
• Send local PLC registers %R50-%R57 to the remote Host.
• Repeat the send ten (10) times once every 7 seconds with a time-out of 500 ms. for each read.

The COMREQ function block for this example is:

The COMREQ Command Block for this example is:

Address	DEC	Hex	Description
%R300	0017	0011	Length of Send Information Report Data Block
%R301	0000	0000	Always zero
%R302	0008	0008	Memory type or CRS word (%R)
%R303	0009	0009	CRS word address minus 1 (%R10)
%R304	0000	0000	Reserved
%R305	0000	0000	Reserved
%R306	2010	07DA	Send Information Report Channel Command number
%R307	0007	0007	Channel number (7)
%R308	0010	000A	Number of repetitions (10)
%R309	0003	0003	Time unit for send period (3 = seconds)
%R310	0007	0007	Minimum interval between host accesses (7 seconds)
%R311	0050	0032	Time-out on each individual host transfer response (500 ms)
%R312	0008	0008	Memory type from which to send data (%R)
%R313	0050	0032	Starting address from which to send data (%R50)
%R314	0008	0008	Number of memory units (8 registers)
%R315	0000	0000	Reserved
%R316	0000	0000	Reserved
%R317	0001	0001	Remote network address type (IP address)
%R318	0004	0004	Remote network address length in words (4)
%R319	0192	00c0	Remote Host - Register 1 of IP address (192)
%R320	0168	00A8	Remote Host - Register 2 of IP address (168)
%R321	0000	0000	Remote Host - Register 3 of IP address (0)
%R322	0002	0002	Remote Host - Register 4 of IP address (2)