1756-PM003H-EN-E, SFC and ST Programming Languages ...

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$Course Material\Efficiently Coding Communication Protocols in C++ ...$

13-6 Force Logic Elements What to Force You can force these elements of a project: If you want to: override an input value, output value, produced tag, or consumed tag override the conditions of a transition one time to go from an active step to the next step override one time the force of a simultaneous path and execute the steps of the path override the conditions of a transition in a sequential function chart execute some but not all the paths of a simultaneous branch of a sequential function chart Then: Add an I/O Force Step Through a Transition or a Force of a Path Add an SFC Force When to Use an I/O Force Use an I/O force to: • override an input value from another controller (i.e., a consumed tag) • override an input value from an input device • override your logic and specify an output value for another controller (i.e., a produced tag) • override your logic and specify the state of an output device IMPORTANT Forcing increases logic execution time. The more values you force, the longer it takes to execute the logic. IMPORTANT I/O forces are held by the controller and not by the programming workstation. Forces remain even if the programming workstation is disconnected. When you force an I/O value: • You can force all I/O data, except for configuration data. • If the tag is an array or structure, such as an I/O tag, force a BOOL, SINT, INT, DINT, or REAL element or member. • If the data value is a SINT, INT, or DINT, you can force the entire value or you can force individual bits within the value. Individual bits can have a force status of: – no force – force on – force off • You can also force an alias to an I/O structure member, produced tag, or consumed tag. – An alias tag shares the same data value as its base tag, so forcing an alias tag also forces the associated base tag. Publication 1756-PM003H-EN-E (excerpt from 1756-PM001H-EN-P) - August 2005
Force Logic Elements 13-7 – Removing a force from an alias tag removes the force from the associated base tag. Force an Input Value Forcing an input or consumed tag: • overrides the value regardless of the value of the physical device or produced tag • does not affect the value received by other controllers monitoring that input or produced tag Force an Output Value Forcing an output or produced tag overrides the logic for the physical device or other controller (s). Other controllers monitoring that output module in a listen-only capacity will also see the forced value. Add an I/O Force To override an input value, output value, produced tag, or consumed tag, use an I/O force: ATTENTION ! Forcing can cause unexpected machine motion that could injure personnel. Before you use a force, determine how the force will effect your machine or process and keep personnel away from the machine area. • Enabling I/O forces causes input, output, produced, or consumed values to change. • If forces are enabled and you install a force, the new force immediately takes effect. 1. What is the state of the I/O Forces indicator? If: off flashing solid Then note: No I/O forces currently exist. No I/O forces are active. But at least one force already exists in your project. When you enable I/O forces, all existing I/O forces will also take effect. I/O forces are enabled (active). When you install (add) a force, it immediately takes effect. 2. Open the routine that contains the tag that you want to force. Publication 1756-PM003H-EN-E (excerpt from 1756-PM001H-EN-P) - August 2005
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