Rockwell Automation 1771-DB BASIC MODULE - Manual (Page 77)

Chapter
Programming Block-Transfers 5
5 -3
Input Image Table
Input Image Table Bit Description Used with CALL
①
00 Do not use–Reserved –
01 BTW Req 3 and 6
02 BTR Req 2 and 7
03 Do not use–Reserved –
04 DF1 Status BTR Req 123
05–07 Do not use–Reserved –
10 PRT1 BTW Req 33 (PRT1)
11 PRT1 BTW Ack 34 (PRT1)
12 PRT2 BTR Req/ DF1 BTR Ack 33 (PRT2), 122
13 PRT2/DF1 BTW Ack 34 (PRT2), 123
14 DH-485 READ Ack 49
15 DH-485 WRITE Ack 50
16 DH-485 Status BTR Req 50
17 Unsolicited DH-485/DF1 WRITE 118
①
See Chapter 12 and 13 for information on these calls.
Important: When the BASIC module is in 16-point mode you must
perform all block-transfers synchronously with a PLC-5 family processor.
Asynchronous block transfers do not work with this configuration and
cause the backplane circuit within the module to lock up. The BASIC
module ships with JW5 configured for 8-point mode (Series A
compatible). Unless you are using calls 32, 33, 34, 49, 50, 118, 122, or
123 (see Chapters 12 and 13) you should be in 8 point mode.
Important: You cannot use 2-slot chassis addressing if JW5 is set for 16
point mode. See page 1 -10 for information regarding the backplane
configuration and addressing.
Chapter