CTI 2500 Installation and Operation Guide V2.8
91
APPENDIX B. – SYSTEM STATUS WORDS
The CTI 2500 controller maintains a collection of status words that may be used by user
programs or operator interface equipment to monitor the status of the controller subsystems.
The following table describes the status words.
NOTE: Status Words 243 and above are not supported by Siemens 545 or 555 controllers.
Word
Description
STW 1
Misc. Status and Non-Fatal Errors
Bit 1:3
Unused
Bit 4
Password has been entered
Bit 5
Password is currently disabled
Bit 6
User Program Error Flag (RLL). See STW 200 for error code.
Bit 7
RLL Subroutine Stack Overflow
Bit 8
Time of Day Clock Failure
Bit 9
Unused
Bit 10
SF Module Communications Failure
Bit 11
Previous RLL Instruction Failed
Bit 12
I/O Module Failure
Bit 13
Communications Port Failure
Bit 14
Scan Overrun
Bit 15
Battery Low
Bit 16
Source RLL Checksum Error
STW 2
Base Controller Status
The most significant bit (1) corresponds to base 15 and the least significant bit
(16) corresponds to the local base (0) as shown below.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
15
14
13
12
11
10
9
8
7
6
5
4
3
3
1
0
Corresponding bit is set to 1 if :
•
The base poll flag is not set (polling disabled), or
•
The base poll flag is set and the base is not present (not online) or is a
failed state (unable to log-in).
