Cutler-Hammer D320 PLC, User Manual

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154
D320 PLC User's Manual
Instruction
Mnemonic Read Intelligent I/O Data Range
Bit
■ Word
READ Read data from the shared
memory of an intelligent I/O unit.
Double words
Ladder
READ: Read NR3 words from slot NN5, module memory
address NR6, and store in words starting at RR1.
Description
1. RR1: Starting address for storing read data (register).
NR3: Number of words to read (number/register).
NN5: Slot number of the intelligent I/O module to read from. The first slot in the backplane is
slot 0.
NR6: Starting address to be read from on the shared memory of the intelligent I/O module
(number/ register).
2. This instruction is used to read data from the shared memory of an intelligent I/O module
such as the high-speed counter, SDU module, analog module, or position control module.
Refer to the specific intelligent I/O module user’s manual for detailed instructions on using
the READ instruction with the given module.
3. This operation will occur on every scan for which the input condition is true (On). To perform
the operation only on a change of input condition, use the rising/falling edge contact.
READ
R
To = RR1 NNx: number
Sz = NR3 NRx: number/register
Fr = NN5:NR6 RRx: register