Program Control Instruction
Chapter 10
10-6
Figure 10.3
Immediate Input Instruction
10129
Immediate Input instruction
interrupts program scan
I/O scan
Program scan
Examine bits in word
112 here in program
Word 112
Returns to
program scan
16 bits from one module
group written into input
image table word
module group
(input)
2slot
I/O group
An Immediate Output Update instruction interrupts the program scan to
update the module group with data from corresponding output image table
word address (Figure 10.4). The image table is updated before the normal
I/O scan and executed each program scan when the rung is true. It can be
programmed unconditionally. This instruction immediately transfers
output data from the selected 16-bit word in the output image table without
waiting for the normal I/O scan.
