User guide

3-5 Overview of PROFIBUS DP Communication
3-23
- PROFIBUS DP Compatible Network Unit DL-PD1 User's Manual (IL) -
Executing Communication
3
Communication Methods
The following describes how the master cyclically communicates with the DL-PD1
(cyclic communication).
• "Reading an output from a sensor amplifier" (page 3-23)
• "Entering an external input to a sensor amplifier" (page 3-24)
• "Reading comparator values (P.V. values) from sensor amplifiers" (page 3-25)
Reading an output from a sensor amplifier
Available outputs: High,Low,Go
This example shows how to read the High output from Slot 1 (ID01).
 In the monitor mode
(1) The output from the sensor amplifier entered into Bit 0 of the input octet 2 via cyclic
communication. (In the big endian format)
This example shows how to read the High output from the sensor amplifier ID01.
 In the I/O mode
(1) The output from the sensor amplifier entered into Bit 1 of the input octet 1 via cyclic
communication. (In the big endian format)
Output
High output of ID01
Sensor amplifier
Master
Slot 1
Bit 0 of the input octet 2
1
0
ON
OFF
(1)
Master
DL-PD1 (Slot 0)
Bit 1 of the input octet 1
Sensor amplifier
Output
High output of ID01
1
0
ON
OFF
(1)