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Programming manual M238 | 3 MB - BERGER - POSITEC

Programming manual M238 | 3 MB - BERGER - POSITEC

Programming manual M238 | 3 MB - BERGER - POSITEC

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Controller States and Behaviors<br />

Task and I/O Behavior When Update IO While In Stop Is Selected<br />

When the Update IO while in stop setting is selected:<br />

The Read Inputs operation continues normally. The physical inputs are read<br />

and then written to the %I input memory variables.<br />

The Task Processing operation is not executed.<br />

The Write Outputs operation continues. The %Q output memory variables are<br />

updated to reflect either the Keep current values configuration or the Set all<br />

outputs to default configuration, adjusted for any output forcing, and then<br />

written to the physical outputs.<br />

NOTE: if Q0, Q1, Q2 or Q3 outputs are configured for PTO, PWM, FG, or HSC<br />

operation, they fallback to a value of 0 irrespective of the configured fallback setting.<br />

For PTO operation, outputs Q0, Q1, Q2, and Q3 execute a fast stop deceleration.<br />

Outputs configured for PWM, FG, and HSC go immediately to 0.<br />

WARNING<br />

UNINTENDED EQUIPMENT OPERATION<br />

Design and program your system so that controlled equipment assumes a<br />

safe state when the controller enters fallback mode if you use outputs Q0,<br />

Q1, Q2, or Q3 for PTO, PWM, FG, or HSC operation.<br />

Failure to follow these instructions can result in death, serious injury,<br />

or equipment damage.<br />

NOTE: Commands received by Serial, USB, and CAN communications can<br />

continue to write to the memory variables. Changes to the %Q output memory<br />

variables are written to the physical outputs.<br />

CAN Behavior When Update IO While In Stop Is Selected<br />

The following is true for the CAN buses when the Update IO while in stop setting<br />

is selected:<br />

The CAN bus remains fully operational. Devices on the CAN bus continue to<br />

perceive the presence of a functional CAN Master.<br />

TPDO and RPDO continue to be exchanged.<br />

The optional SDO, if configured, continue to be exchanged.<br />

The Heartbeat and Node Guarding functions, if configured, continue to<br />

operate.<br />

If the Behaviour for outputs in Stop field is set to Keep current values, the<br />

TPDOs continue to be issued with the last actual values.<br />

If the Behaviour for outputs in Stop field is Set all outputs to default the<br />

last actual values are updated to the default values and subsequent TPDOs<br />

are issued with these default values.<br />

EIO0000000384 04/2012 51

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