Rockwell Automation 900 Temperature Controller Communications Functions - Series B User 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