BASEstar^tm Classic DAS
for Allen-Bradley
INTERCHANGE^tm Software
Installation and User's Guide

The loop function sends a diagnostic loop-back message and waits for a response. The source of the response depends upon the extent of the diagnostic message as determined by the LOOP command qualifier or the loop_flag argument to the device connection management callable service. Table 3-10 describes the path of the diagnostic message according to the specified parameter.

Parameter	Response
/PE ILAN$K_LOOP_PE	Elapsed time
/NI ILAN$K_LOOP_NI	Elapsed time

The Loop PE function sends a message to the PE and a response is returned by the PE.

The Loop NI function is routed through the NI to the DTL server process. The server process returns the message back through the NI. The Loop NI function is a good method of determining the availability of the DTL server process.

Table 3-10 describes how to access the loop diagnostic function through the BASEstar Classic interfaces.

Table 3-10 Loop Interface Access

Interface	Function Name
CLI	LOOP
API	ILAN$LOOP_DEVICE
	ILAN$LOOP_DEVICE_A
Menu	Not available

Example 3-9 shows the information displayed by the LOOP command.

Example 3-9 Loop Output

DCM> LOOP DTL5/PE ELAPSED: 0 00:00:00.04 CPU: 0:00:00.03 BUFIO: 0 DIRIO: 0 FAULTS: 0 DCM> LOOP DTL5/NI ELAPSED: 0 00:00:00.11 CPU: 0:00:00.02 BUFIO: 0 DIRIO: 0 FAULTS: 0

3.2.5 Simple Compare Function

The simple compare function allows a BASEstar Classic library file related to a device to be compared to another existing BASEstar Classic library file of the same type. The BASEstar Classic library file must have been uploaded into the library directly or imported by the appropriate library function.

Simple compare is only supported by the EI Network Interface option of the DAS. Only PLC-5 family memory images (not including the PLC-5/250) may be compared.

Table 3-11 describes how to access the simple compare function through the BASEstar Classic interfaces.

Table 3-11 Simple Compare Interface Access

Interface	Function Name
CLI	Not available
API	Not available
Menu	Library File Compare File
Menu	Library External Compare Device

The default compare behavior for DAS for AB INTERCHANGE software is controlled by the BASEstar Classic parameter ILAN$DTL_SCMP_FLAGS. The values and defaults for these compare qualifiers are described in Table 3-12.

Table 3-12 Simple Compare Qualifiers

Qualifier	Default	Description
ALL		All compare options are checked
[NO]TYPE	TYPE	Memory images must be of the same PLC type
[NO]REVISION	NOREVISION	Memory images must be of the same PLC type, series and revision
[NO]MEMSIZE	MEMSIZE	Memory images must have the same memory size
[NO]NUMTABLES	NUMTABLES	Memory images must have the same number of data table files.
[NO]NUMPROGRAMS	NUMPROGRAMS	Memory images must have the same number of program files.
[NO]DATATABLES	NODATATABLES	Compare the data tables
[NO]FORCES	FORCES	Compare the forces
[NO]DIRECTORY	DIRECTORY	Compare program directories
[NO]LADDER	LADDER	Compare the ladder logic.