Despatch Protocol Plus Modbus Communications - Manual (Page 16)

Chromalox Instruments and Controls
A-51643 Rev. 6 10/06/03 10
3.6 Holding Register Assignments
Holding registers are intended for information and functions that can be read or written. Each holding
register has a corresponding internal memory variable in the slave device. This association is shown in
the address map table.
Table 6: Protocol
TM
Plus Holding Register Address Map
Data
Address
Hex
Address Description
Page[menu]
Association or
Range (default
value)
Security
Level Comments
Global Holding Registers
0 0 Communications Security Code 0-999 (0) 0 Security code setting for remote interface.
1 1 Temperature Display Units PID[Temp Unit] 1 or 2 (Note 1) 0 = deg. F, 1 = deg. C.
2 2 Reserved for factory use
3 3 Reserved for factory use
4 4 Reserved for factory use
5 5 Keypad Lockout 0 = normal, 1 = locked (0) 2 Disables front panel keypad
6 6 Controller Mode
Read: 1 – 5
Write: 1 - 4
0 1=Manual, 2=Timer, 3=Profile, 4=Autostart, 5=Setup
7 7 Alarm Acknowledge 0 - $FFFF 0 0 = No Action, >0 = Alarm Acknowledge
8 8 Level 1 Password Enable[Password 1] 2 0 – 999 (Write not allowed while in setup mode)
9 9 Level 2 Password Enable[Password 2] 2 0 – 999 (Write not allowed while in setup mode)
10 A Key Press Beep Control[Key Beep] 1 or 2 (Note 1) 0 = off, 1 = on
11 B End of Cycle Beep Control[EOC Beep] 1 or 2 (Note 1) 0 = off, 1 = on
12 C Alarm Beep Control[Alarm Beep] 1 or 2 (Note 1) 0 = off, 1 = on
13 D Setpoint Change Enable Enable[SPChange] 2 0 = no, 1 = yes
14 E Analog output type Enable[Aout] 2 0 = Control (Default), 1 = Process
15 F Reserved, Available to application 0 0
Control Loop Holding Registers
16 10 Manual SP Manual[setpt] 0 read/written as xxxx deg. F.
17 11 Manual High Limit SP Manual[Hi-Lim SP] 0 read/written as xxxx deg. F.
18 12 Manual Event 1-4 Setup $0 - $F ($0) 0 Bits 0-3 = Events 1-4. Bit value: 0 = Off, 1 = On
19 13 NA 0 0
20 14 Proportional Band (Heat) PID[P (H)] 1 or 2 (Note 1) read/written as xxxx deg. F.
21 15 Integral Reset (Heat) PID[I (H) Rep/Min] 1 or 2 (Note 1) value is in repeats/min
22 16 Derivative Rate (Heat) PID[I (H) in sec] 1 or 2 (Note 1) value is in seconds
23 17 Hysteresis Control[Hysteresis] 1 or 2 (Note 1) read/written as xxxx deg. F.
24 18 High Limit Band Control[Hi-Lim Band] 1 or 2 (Note 1) read/written as xxxx deg. F. 4 = Off.
25 19 Cycle Time Control[Cycle Time Sec] 1 or 2 (Note 1) value is in seconds
26 1A Proportional Band (Cool) PID[P(C)] 1 or 2 (Note 1) read/written as xxxx deg. F. (H/C Version 3.1 Only)
27 1B Integral Reset (Cool) PID[I (C) Rep/Min] 1 or 2 (Note 1) value is in repeats/min. (H/C Version 3.1 Only)
28 1C Derivative Rate (Cool) PID[D(C) in Sec] 1 or 2 (Note 1) Value is in Seconds. (H/C Version 3.1 Only)
29 1D Heat Offset PID[Heat Offset] 1 or 2 (Note 1) read/written as xxxx deg. F. (+/- P Band H) H/C Only
30 1E Cool Offset PID[Cool Offset] 1 or 2 (Note 1) read/written as xxxx deg. F. (+/- P Band H) H/C Only