M1 File - Btr/Btw Status Flag Definitions (M1:E.100 - Allen-Bradley 1747-SN User Manual

5–12 RIO Block Transfer
Publication 1747 6.6 - July 1996
M1 File - BTR/BTW Status Flag Definitions (M1:e.100 ... M1:e.3200)
Status Flag Description
M1:e.100/0 through These bits are reserved.
M1:e.100/9
M1:e.100/10 Block Transfer Enabled and Waiting for block transfer to start -
(EW = Enable Waiting)
M1:e.100/11 This bit is reserved.
M1:e.100/12 Block Transfer Error - (ER = Error)
M1:e.100/13 Block Transfer Successful - (DN = Done)
M1:e.100/14 Block Transfer Started - (ST = Started)
M1:e.100/15 This bit is reserved.
When set to a 1" (with bit 14 set to a 0"), bit 10 indicates that a BT operation is pending. You can
program a timer in your SLC control program to cancel a BT prior to bit 14 being set. Note that bit
10 must be set to 1" before your SLC user program can cancel the BT operation.
When set to a 1", bit 12 indicates that an error occurred while the BT was being processed.
M1:e.103 contains an error code that is useful in determining the cause of an error. Once this bit
is set, the SLC user program can reset the Enable (EN) bit in the M0 BT buffer so that a new BT
can occur.
When set to a 1", bit 13 indicates the successful completion of a BT operation. If the operation
was a BTR, the BT data is available in the M1 BT buffer. Once this bit is set, the SLC user
program can reset the Enable (EN) bit in the M0 BT buffer so that a new BT can occur.
When set to a 1", bit 14 indicates that a BT operation has started. Once the BT operation starts,
an RIO system 4 second timer begins counting down. You can program a timer in your SLC user
program to cancel a Started (bit 14) BT.