Horner APG RCS SmartStix User Manual
Page 13
CH.1
15 MAR 2003
PAGE 13
MAN0305-04
1.3.2
Resource Definitions
This section defines the resources listed in Table 1.2.
System Registers
System Registers (%S and %SR) are used to store general OCS or RCS status information. This
information is used internally, and is also available to the operator via the System Menu, using the Control
Station’s display and keypad. The System Registers are also available for User Screens and can be
accessed by Ladder Code.
a.
%S Registers
%S Registers are 1-bit memory locations, containing system status information, implemented as shown in
Table 1.3:
Table 1.3 - %S Registers
Register
Name
Description
%S1
FST_SCN
On during first scan after entering RUN mode
%S2
NET_OK
On if Network is functioning properly
%S3
T_10MS
On for 5 mS; Off for 5 mS
%S4
T_100MS
On for 50 mS; Off for 50 mS
%S5
T_SEC
On for 500 mS; Off for 500 mS
%S6
IO_OK
On if SmartStack I/O is configured properly
%S7
ALW_ON
Always On
%S8
ALW_OFF
Always Off
b.
%SR Registers
%SR Registers are 16-bit memory locations, containing system status information, implemented as
shown in Table 3. Note: Where 2 %SRs are combined to make a 32-bit value, the lower numbered %SR
is the low word, while the higher numbered %SR is the high word.
Table 1.4
- %SR Registers
Register
Name
Description
Min
Max
%SR1
USER_SCR
Current User Screen Number (0=none)
0
200
%SR2
ALRM_SCR
Current Alarm Screen Number (0=none)
0
200
%SR3
SYS_SCR
Current System Screen Number (0=none)
0
11
%SR4
SELF_TEST
Bit-Mapped Self-Test Result
0
65535
%SR5
CS_MODE
Control Station Mode
(0=Idle, 1=Do I/O, 2=Run)
0
2
%SR6
SCAN_RATE
Average Scan Rate (in tenths of mS)
-
1000
%SR7
MIN_RATE
Minimum Scan Rate (in tenths of mS)
-
1000
%SR8
MAX_RATE
Maximum Scan Rate (in tenths of mS)
-
1000
%SR9-10
EDIT_BUF
Data Field Edit Buffer
0
2
32
-1
%SR11-12
LADDER_SIZE
Ladder Code Size
2
64K
%SR13-14
UTXT_SIZE
User Text Screen Table Size
4
64K
%SR15-16
Reserved
-
-
-
%SR17-18
IO_SIZE
I/O Configuration Table Size
16
64K
%SR19-20
NET_SIZE
Network Configuration Table Size
34
32K
%SR21-22
SD_SIZE
Security Data Table Size
-
-
%SR23
LADDER_CRC
Ladder Code CRC
0
65535
%SR24
UTXT_CRC
User Text Screen Table CRC
0
65535
%SR25
Reserved
-
-
-
%SR26
IO_CRC
I/O Configuration Table CRC
0
65535
%SR27
NET_CRC
Network Configuration Table CRC
0
65535