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TS3738N1E7

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TS4126N1017E235

TS4127N1017E215

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TS4231N6E17

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TS4244N3E24

TS4502N1000E200

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time".
Table 7- 116 Cycle time values
Cycle time monitor Minimum value Maximum value Default value
Maximum cycle time 1 ms 6000 ms 150 ms
Watchdog timeout
If the maximum scan cycle timer expires before the scan cycle has been completed, an error
is generated. If an error handling code block OB 80 is included in the user program, the CPU
executes OB 80 where you may add program logic to create a special reaction. If OB 80 is
not included, the first timeout condition is ignored and the CPU goes to STOP.
If a second maximum scan time timeout occurs in the same program scan (2 times the
maximum cycle time value), an error is triggered that causes the CPU to transition to STOP
mode.
In STOP mode, your program execution stops while CPU system communications and
system diagnostics continue.
7.8.16 Stop scan cycle instruction
Table 7- 117 STP instruction
LAD / FBD SCL Description
STP(); STP (Stop scan cycle) puts the CPU in STOP mode. When the CPU is in
STOP mode, the execution of your program and physical updates from the
process image are stopped.
For more information see: Configuring the outputs on a RUN-to-STOP transition (Page 87).
If EN = TRUE, then the CPU goes to STOP mode, the program execution stops, and the
ENO state is meaningless. Otherwise, EN = ENO = 0.
7.8.17 Get Error instructions
The get error instructions provide information about program block execution errors. If you
add a GetError or GetErrorID instruction to your code block, you can handle program errors
within your program block. Indicates that a local program block execution error has occurred and fills a
predefined error data structure with detailed error information. Error data structure: You can rename the structure, but not the members within the
structure. ERROR_ID Word Error ID
FLAGS Byte Shows if an error occurred during a block call.
 16#01: Error during a block call.
 16#00: No error during a block call.
REACTION Byte Default reaction:
 0: Ignore (write error),

1: Continue with substitute value "0" (read error),
 2: Skip instruction (system error)
CODE_ADDRESS CREF Information about the address and type of block
BLOCK_TYPE Byte Type of block where the error occurred:
 1: OB
 2: FC
 3: FB
CB_NUMBER UInt Number of the code block
OFFSET UDInt Reference to the internal memory
Access mode: Depending on the type of access, the following
information can be output: OPERAND_NUMBER UInt Operand number of the machine command
POINTER_NUMBER_
LOCATION
UInt (A) Internal pointer
SLOT_NUMBER_SCOPE UInt (B) Storage area in internal memory
DATA_ADDRESS NREF Information about the address of an operand
AREA Byte (C) Memory area:
 L: 16#40 – 4E, 86, 87, 8E, 8F, C0 – CE
 I: 16#81
 Q: 16#82
 M: 16#83
 DB: 16#84, 85, 8A, 8B
DB_NUMBER UInt (D) Number of the data block
OFFSET UDInt (E) Relative address of the operand Indicates that a program block execution error has occurred and reports the ID
(identifier code) of the error.
By default, the CPU responds to a block execution error by logging an error in the
diagnostics buffer. However, if you place one or more GetError or GetErrorID instructions
within a code block, this block is now set to handle errors within the block. In this case, the
CPU does not log an error in the diagnostics buffer. Instead, the error information is reported
in the output of the GetError or GetErrorID instruction. You can read the detailed error
information with the GetError instruction, or read just the error identifier with GetErrorID
instruction. Normally the first error is the most important, with the following errors only
consequences of the first error.

The first execution of a GetError or GetErrorID instruction within a block returns the first error
detected during block execution. This error could have occurred anywhere between the start
of the block and the execution of either GetError or GetErrorID. Subsequent executions of
either GetError or GetErrorID return the first error since the previous execution of GetError or
GetErrorID. The history of errors is not saved, and execution of either instruction will re-arm
the PLC system to catch the next error.
The ErrorStruct data type used by the GetError instruction can be added in the data block
editor and block interface editors, so your program logic can access these values. Select
ErrorStruct from the data type drop-down list to add this structure. You can create multiple
ErrorStruct elements by using unique names. The members of an ErrorStruct cannot be
renamed.