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P6100, P8100 & P4100 Controllers – Serial Communications Parameters
The Modbus parameter addresses, and the possible ASCII message types and parameter
indents for the P6100, P8100 & P4100 are detailed below. RO indicates a parameter is read
only, R/W indicates it can also be written to. Communications writes will not implemented if
the Communications Write Parameter is disabled. Refer to the Modbus and ASCII
Communications sections of this manual for details of the protocols used.
Bit Parameters
Bit parameters are not applicable to the ASCII protocol.
Table 14. P6100, P8100 & P4100 Communications - Bit Parameters
Parameter
Communication
Write Status
Auto / Manual
Self Tune
Pre tune
Alarm 1 Status
Alarm 2 Status
Setpoint Ramping
Loop Alarm Status
Loop Alarm
Digital Input 2
To set the bit value to 1 write FF, to set the bit value to 0 write 00. Refer to Function Code 05 in the
Modbus Communications section.
Word Parameters
Table 15. P6100, P8100 & P4100 Communications - Word Parameters
Parameter
Process Variable
Setpoint
Output Power
59305, Issue 5 – March 2005
- DIN Controllers & Indicators - Product Manual
Modbus
Notes
Parameter No.
RO
1 = Write Enabled, 0 = Write Disabled. A negative
1
acknowledgement (exception code 3) is sent to write
commands if communications writes are disabled
2
R/W
1 = Manual Control, 0 = Automatic Control
3
R/W
1 = Activate(d), 0 = Dis-engage(d)
4
R/W
1 = Activate(d), 0 = Dis-engage(d)
5
RO
1 = Active, 0 = Inactive
6
RO
1 = Active, 0 = Inactive
7
R/W
1 = Enable(d), 0 = Disable(d)
10
R/W
1 = Active/Enable, 0 = Inactive/Disable
12
R/W
Read to get loop alarm status. Write 0/1 to
disable/enable.
13
RO
State of Option B digital input.
(RSP models only).
Modbus
ASCII Ident &
Parameter No.
Message Types
1
RO
2
R/W
Type 3/4
3
R/W
Type 3/4
Notes
M
Current value of PV.
RO
Type 2
If under-range = 62976 (<??>5 ASCII)
If over-range = 63232 (<??>0 ASCII)
If Sensor break = 63488 (ASCII = n/a)
S
Value of currently selected setpoint.
Type 2
RO
(Target setpoint if ramping).
R/W
Parameter is read only if the current
setpoint is RSP.
W
0% to 100% for single output; −100%
Type 2
RO
to +100% for dual output control.
R/W
Read Only if not in manual control.
P6700, P8700& P4700 Model Group
Page 51
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