R-S108V01-16-24VDC-C10-1 industrial control spare parts card ABB module
Technical data of product parameters
Is set when the processor detects an error and stops operation of the
instruction. For example, an error occurs if the length (LEN) is less than or
equal to zero or if the position (POS) is less than zero. R-S108V01-16-24VDC-C10-1 The ladder program
must reset the ER bit if the instruction detects an error.
The Read Program Checksum (RPC) instruction copies the checksum of the
user ladder program from either the processor’s RAM memory or from the
installed memory module into the designated destination integer file location.
The program checksum is a 16-bit value that is calculated for the entire ladder
logic image, excluding the data table values. The checksum changes any time R-S108V01-16-24VDC-C10-1
program edits are made. Therefore, the RPC instruction can be used within the
ladder logic to determine whether online edits have changed the checksum
from a known value or can verify the program in the memory module matches R-S108V01-16-24VDC-C10-1
the program in the processors RAM memory. If a mismatch is detected,
additional ladder logic may trigger an alarm bit for a higher level HMI to
evaluate or even fault the processor so that it cannot run with a modified
program.Block transfer instructions are supported by SLC 5/03 (OS302, Series C),
SLC 5/04 (OS401, Series C) and SLC 5/05 (OS501, Series C) and higher
processors using RSLogix 500 version 4.10 and higher. With block-transfer
instructions, you can transfer up to 64 words to or from a remote device over
an Allen-Bradley Remote I/O (RIO) link. A Block Transfer Read (BTR) is
used to receive data from a remote device. A Block Transfer Write (BTW) is
used to send data to a remote device. The RIO Series B scanner (1747-SN)
modules and the back-up scanner (1747-BSN) modules perform block
transfers via M0 and M1 file buffers. R-S108V01-16-24VDC-C10-1
A false-to-true rung transition initiates a BTW or BTR instruction. The BTW
instruction tells the processor to write data stored in the BTW Data File to a
device at the specified RIO rack/group/slot address. The BTR instruction tells
the processor to read data from a device at the specified RIO rack/group/slot
address and store it in the BT Data File. The Data File may be any valid
integer, floating point or binary data table file. A total of 32 block transfer
buffers are available; you can execute a maximum of 32 different block
transfers. Each buffer is made up of 100 consecutive words. The processor
runs each block transfer request in the order it is requested. When the
processor changes to Program mode, all pending block transfers are cancelled.
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