P6700, P8700 & P4700 Controllers - Serial Communications Parameters; Bit Parameters; Word Parameters; Table 19. P6700, P8700 & P4700 Communications - Bit Parameters - WEST P8700 User Manual

P6700, P8700 & P4700 Controllers – Serial Communications Parameters
The Modbus parameter addresses, and the possible ASCII message types and parameters
indents for the P6700, P8700 & P4700 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 19. P6700, P8700 & P4700 Communications - Bit Parameters
Parameter
Communication
Write Status
Limit Action
Reset Limit Relay
Limit Status
Alarm 1 Status
Alarm 2 Status
Limit Output Status
Annunciator Output
Status
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 20. P6700, P8700 & P4700 Communications - Word Parameters
Parameter
Process Variable
Limit Setpoint
Hold Value
Page 66
1 1
/ -DIN, / -DIN &
4 8
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 RO 1 = Low Limit, 0 = High Limit
3 R/W 1 = Reset Latched Relays. A read returns the values 0
4 RO 1 =In Exceed Condition, 0 = Not in Exceed Condition
5 RO 1 = Active, 0 = Inactive
6 RO 1 = Active, 0 = Inactive
7 RO 1 = Relay latched, 0 = Relay not latched
8 RO 1 = Active, 0 = Inactive
Modbus ASCII Ident &
Parameter No. Message Types
1 RO
2 R/W
Type 2, 3/4
3 R/W
P6700, P8700& P4700 Model Group
1
/ - DIN Controllers & Indicators - Product Manual
16
Notes
M Current value of PV.
Type 2 RO
If under-range = 62976 (<??>5 ASCII)
If over-range = 63232 (<??>0 ASCII)
If Sensor break = 63488 (ASCII = n/a)
S Value of the Limit Setpoint.
R/W
A Highest PV value (High Limit Action)
Type 2 RO or Lowest PV value (Low Limit Action)
since this parameter was last reset.
Modbus: Write any value to reset
ASCII:
00160 for reset.
See Controller Command
59305, Issue 5 – March 2005