Log

General Action Statement

Syntax samples

LOG <string>, <expression>

LOG “Activity Time”, Attr1

Description

MedModel assumes that the time stored in the expression is in the model’s default time units set in the General Information dialog box. Use the LOG statement to record the time from one statement to another by storing the time of the first statement in an attribute, variable, or array element with CLOCK() and using the same attribute, variable, or array element as the expression in the LOG statement. Use the LOG statement to determine throughput time or throughput in a section of the facility.

Valid In

Downtime logic, operation logic, node entry and exit logic, arrival, shift and break logic and routing exit logic.

Components

This string will be stored in the file before the result of the log expression and may not be a string expression. Use this string to identify the number that follows.

The result of this expression subtracted from the model’s current time will be stored in the file <model name>.LAP, after the string above.

Example

The example below shows a LOG statement used to capture each Client’s total throughput time as they travel through the system. Time starts when the Client arrives at Receptionist and stops when the Client exits through the door. The first process sets attribute CT equal to the current clock time. Next, Clients are sent randomly to one of three offices. Finally, when a Client leaves the system at location OutDoor, the LOG statement records the cycle time by subtracting the time stored in attribute CT from the current simulation time.

Process Table

Entity...	Location...	Operation (min)...
Client	Reception	CT=CLOCK()
Client	Auditor	WAIT T(5,6,8)
Client	Loan	WAIT T(4.5,5,7)
Client	Service	WAIT N(6.2,1.1)
Client	OutDoor	LOG “Cycle Time”, CT

Routing Table

Blk	Output...	Destination...	Rule...	Move Logic...
1	Client	Auditor Loan Service	RANDOM 1 RANDOM RANDOM	MOVE FOR 1.5
1	Client	OutDoor	FIRST 1	MOVE FOR 0.5
1	Client	OutDoor	FIRST 1	MOVE FOR 0.5
1	Client	OutDoor	FIRST 1	MOVE FOR 1.2
1	Client	EXIT