Rockwell Automation 900 Temperature Controller Communications Functions - Series B - Manual (Page 98)

Publication 900-UM004D-EN-E - July 2010
5-16 Communications Data for Modbus
➊ When the control output ON time is less than 190 ms, the bit is set to “1” and the heater current is held at the last current value.
➋ “Spare” bits are always OFF.
➌ When read in setup area 1, the status of the bits will be as follows:
Alarm outputs: Cleared
Overcurrent: Last value held HB error: Last value held
Input error: Last value held HB and HS outputs: Cleared
Program end output: Cleared Current hold: Last value held
Display range exceeded: Last value held Heating and cooling outputs: Cleared
➍ NA for 900-TC8 , 900-TC16, and 900-TC32
Table 5.11 Status Details
Bit Position Status Bit Description
0 1
Status
(lower word) 0 Heater Overcurrent (CT1) Not generated Generated
1 Heater Current Hold (CT1) ➊ Update Hold
2 A/D Converter Error Not generated Generated
3 HS Alarm Output (CT1) OFF ON
4 Spare➋ OFF —
5 Display Range Exceeded Not generated Generated
6 Input Error Not generated Generated
7 Spare➋ OFF —
8 Control Output (Heating) OFF ON
9 Control Output (Cooling) OFF ON
10 HB (Heater Burnout) Alarm Output (CT1) OFF ON
11 HB (Heater Burnout) Alarm Output (CT2) OFF ON
12 Alarm Output 1 OFF ON
13 Alarm Output 2 OFF ON
14 Alarm Output 3 OFF ON
15 Program End Output OFF ON
Status
(upper word) 16 Event Input 1 OFF ON
17 Event Input 2 OFF ON
18 Event Input 3 ➍ OFF ON
19 Event Input 4 ➍ OFF ON
20 Write Mode Backup mode RAM write mode
21 EEPROM RAM = EEPROM RAM
≠
EEPROM
22 Setup Area Setup area 0 Setup area 1➌
23 AT Execute/Cancel AT canceled AT execution in progress
24 RUN/STOP Run Stop
25 Communications Writing OFF (disabled) ON (enabled)
26 Auto/Manual Switch Automatic mode Manual mode
27 Program Start Reset Start
28 Heater Overcurrent (CT2) Not generated Generated
29 Heater Current Hold (CT2) ➊ Update Hold
30 Spare➋ OFF —
31 HS Alarm (CT2) OFF ON