AB Rockwell new module industrial control equipment 1785-BCM/C

AB Rockwell new module industrial control equipment 1785-BCM/C

Technical data of product parameters

A 1785-BCM/C instruction writes information into its control structure
address (a three-word integer Control Block) when the instruction is entered.
The processor uses these values to execute the transfer.
You must enter an M1 file address into BTR Instructions and an M0 file
address into BTW Instructions. However, each instruction uses both the M0
and M1 file for that one hundred word buffer (1 through 32). For example, to
use the first available buffer (1) for a BTR, enter M1:e.100 into the “Buffer
File” field. However, M0:e.100 is also used by this BTR. So, the next BT
instruction must use another M-file buffer (2 through 32)The RIO scanner performs block transfers through control/status buffers 1785-BCM/C
allocated in the scanner’s M0 and M1 files. For BTW’s, the data stored in the
Data File is copied into the M0 block transfer buffer, the M0 block transfer
buffer is then transferred to the RIO device. The corresponding M1 block
transfer buffer contains only BTW status information. For BTR’s, the M0
block transfer buffer contains only BTR control information. The actual data
read from the remote device is received in the scanner’s M1 block transfer
buffer. This data is then copied into the BTR Data File. A total of 32 block
transfer control/status buffers exist in the M0 (output/control) and the M1
(input/status) files.Transmitted Word Count is the status of the actual number of BTW words 1785-BCM/C
sent or the number of BTR words received. The processor uses this number to 1785-BCM/C
verify the transfer. This number should match the requested word count
(unless the transmitted word count is zero). If these numbers do not match,
the processor sets the ER bit (bit 12). If there is an error, the processor gives
the error code in Word 2 of the control structure in the form of a negative
number. See Table 8.4, “BTR/BTW Error Codes,” for a list of error codes.
Only one error code is stored at a time (a new error code overwrites the
previous error code).The scanner processes the BTR/BTW when it detects that the SLC
control program rung, which contains the BTR/BTW, goes true.
If the RIO scanner detects any problem at this point (such as invalid
block transfer control field, or unconfigured device), the control
structure word 2 fills with the error code and the ER bit (bit 12) is set. If
no problems occur, the EW bit (bit 10) and ST bit (bit 14) are set in the
control block. 1785-BCM/C

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