XIC STOP BST XIC START ONS XYZ NXB XIC OUTPUT BND XIO FIRST SCAN OTE OUTPUT
Again, RIO and DNet PLC5 networks are UPDATED OUT OF SYNC WITH REGARD OF THE PLC SCAN; the data Read/Written is not processed like ordinary IO.
BTR - Block Transfer Read
Type - Input/Output
Description
Transfer up to 64 words at a time from a block transfer module in a local or remote I/O chassis or 64 words from a supervisory processor, when the processor is in adapter mode.
Entering Parameters
Mod Type
Select the module type from thelist that appears when you double-click the field.
Rack No.
Enter a
valid rack number , 00-27 (octal) for a PLC-5, and 00-177 (octal) for SoftLogix 5.
Group
Enter the I/O group number (0-7) which specifies the position of target module in the chassis.
Module
Enter the slot number (0-1) within the group.
Control Block
It is recommended that you use a block transfer (BT) data file or a five word Integer (N) data file for the control block, although other integer data types will work. Racks 10-27 for a PLC-5 and 10-127 for SoftLogix 5 should use a BT data file type.
Data File
Enter the address of the input, output, status, integer, float, binary, BCD, or ASCII data file from which (write) or into which (read) the processor transfers data. Note: you cannot use indirect addresses for the data file address in a BTR or BTW instruction.
Length
Enter the number of words to transfer. When configuring intelligent I/O (except the QB module) the length is automatically adjusted to accommodate the configuration data of the module.
Continuous
Choose
Yes or No from the list that appears when you double-click on the field in RSLogix 5.
Status Bits
Used to address sub-elements of the control address.
EN/15
Enable Bit
Enabled-Waiting Bit
ST/14
Start Bit
No Response Bit
DN/13
Done Bit
Time Out Bit
ER/12
Error Bit
Read/Write Bit (1=Read, 0=Write)
CO/11
Continue Bit
Bit labels may delimit BT file elements (for example, BT20:1.EN), bit numbers refer to the first word of a five word Integer (N) control block. Bits 00-06 store the I/O module address.
Note: Bit labels (.EN, .ST, .CO, and so on.) can only be used with the block transfer data type (BT).
Caution: Except for the .CO and .TO bits, do not modify status bits while the block transfer is enabled or unpredictable operation could occur with possible damage to equipment and/or injury to personnel.
Caution: The processor runs block transfer instructions asynchronously to program scan. The status of these bits could change at any point in the program scan. If you examine these bits in ladder logic, copy the status once to a storage bit whose status is synchronized with the program scan. Otherwise, timing problems may invalidate your program with possible damage to equipment and/or injury to personnel
ONS - One-Shot
Type - Bit
Description
The ONS instruction is an input instruction that makes the rung true for one program scan upon a false-to-true transition of the conditions preceding the ONS instruction on the rung.
Use the ONS instruction to start events that are triggered by a pushbutton, such as pulling values from thumbwheel switches or freezing rapidly displayed LED values.
You must enter a bit address for the bit. Use either a binary file or integer file address.
Sample Addresses:
N7:6/0 (Integer file seven, word six, bit zero)
B3/0 (Bit file three, bit zero)
Note: During prescan, the bit address is set to inhibit false triggering when the program scan begins.
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