Rockwell Automation 160PD1 160 Profibus Communication Module - Manual (Page 24)

5–4 Profibus Parameter Descriptions and Data Protocol
State Transitions The following Figure 5.1 shows the most important state transitions
Figure 5.1
State Diagram
Parameter Operation According to Table 5.E, three parameter operation bits in the control/
status word allow access to certain parameter values:
Table 5.E
NOT READY TO
SWITCH ON
READY TO
SWITCH ON
x1x1'1111
RUNNING
FAULT
0xxx'1000
Control Words (Low Byte) appear outside the boxes
Status Words (Low Byte) appear inside the boxes
01xx'0000
0011' 0111 0011'0001
0FF1
0FF2
or
0FF3
Acknowledge Bit
0 —> 1
xxxx'x110
Parameter Operation
Bit
15 14 13 Description
0 0 0 0 No operation
1 0 0 1 Read Attributes
2 0 1 0 Read minimum
3 0 1 1 Read maximum
4 1 0 0 Read value
5 1 0 1 Write value
6 1 1 0 Read default
7 1 1 1 Unused