GE GFK-1004B user manual Assign Channel Status Vector, Example Command Block

4

Assign Channel Status Vector (2000)

The Assign Channel Status Vector (ACSV) command specifies the location in local PLC CPU reference table memory of the sixty-four (64) Channel Status bits. This command is required for COMMREQ support when the Ethernet Interface has been configured by Logicmaster 90-70 to be in MMS-ETHERNET configuration mode. If, however, the Ethernet Interface has been configured in TCP/IP configuration mode, this command must not be used. When in TCP/IP configuration mode, Logicmaster 90-70 configures the location of the sixteen LAN Interface Status (LIS) bits as well as the sixty-four Channel Status bits, and all eighty (80) status bits are updated once each PLC scan.

Example Command Block

Specify %T56 (in bit mode) as the starting location for the sixty-four Channel Status bits. Return the COMMREQ Status (CRS) word in %AQ14.

	Dec	(Hex)
Word 1	00003	(0003)	Length of Assign Channel Status Vector data block (3 words)
Word 2	00000	(0000)	Always 0 (no-wait mode request)
Word 3	00012	(000c)	Memory type of CRS word (%AQ)
Word 4	00013	(000d)	CRS word address minus 1 (%AQ14)
Word 5	00000	(0000)	Reserved
Word 6	00000	(0000)	Reserved
Word 7	02000	(07d0)	Assign Channel Status Vector command number
Word 8	00074	(0040)	Memory type where to put Channel Status bits (%T)
Word 9	00056	(0038)	Starting address of Channel Status bits

*Word 4 (CRS word address) is the only zero-based address in the Command Block. Only this address requires subtracting 1 from the intended address.

(Word 7) Channel Command Number: The command parameter in Word 7 requests that the sixty-four (64) bits of Channel Status be assigned to a local reference table address (specified in Words 8 and 9). If the command is processed successfully, the CRS word will indicate successful completion. From that point on, the Ethernet Interface will update sixty-four bits at the specified location each time the status changes. This will continue until either the channel is aborted or another ACSV command is issued.

(Word 8) Memory Type: Words 8 and 9 specify the starting address in local PLC memory for the sixty-four (64) bits of Channel Status. Word 8 specifies the memory type (see Table 4-2).

(Word 9) Starting Address: Starting address to store the Channel Status bits.

Note

If both Word 8 and Word 9 are zero (0), this means ªnoneº, which will cause the Ethernet Interface to stop updating memory with the Channel Status bits. If the address in Words 8 and 9 is valid, the Ethernet Interface will update that memory location with 64 bits of information each time one of those bits change.

4-24 TCP/IP Ethernet Communications User's Manual ± January 1996 GFK-1004B