Siemens SIMATIC S5 Manual page 229

Fundamentals of COM 266
Function key menu:
<F1> Press this key to screen the "Mode Select" form. The actual-
value display is "frozen" to the current value. The "Mode",
"Program", "Distance" and "Override" fields become input
fields, and the cursor is set to the start of the "Mode" field.
<F2> ... <F6> These keys are mode-dependent. Refer to Table 6-3 in
Section 6.6.2 for a key-to-mode assignment list.
<F8> Press this key to exit the "TEST" form and screen the
"FUNCTION SELECT" menu. COM 266 generates mode 17
when you press this key.
And what now?
The "TEST" form's "Mode Select" subform is described in detail in the next
section.
6-62
IP 266
EWA 4NEB 812 6057-02