
IP 240 Counting
EXT : KH 0000 to 0001 Control of count enabling by external or internal starting signal
Bit 0=1 Control of start of count by active signal at GT input
Bit 0=0 Control of start of count by active control bit STRT
PAFE : QB Flag byte
or output byte (0 to 239) in which any errors are flagged
( Section 6.4)
BER : KF 0 Addressing in the I/O area (P area)
1 Addressing in the extended I/O area (Q area)
ABIT : KY x,y x=0 to 255 x>0 : the interrupt service OB is called on every change in the in-
terrupt bit
x=0 : the interrupt service OB is called only when the interrupt bit
goes from 0 to 1
y=0 to 7 the interrupt bit assigned in I/O byte 0 as set on switchbank S1
Note
Interrupt servicing is not disabled in the configuring FBs. You must therefore
ensure the noninterruptibility of the configuring FBs in the S5-115U and S5-135U
(when interrupt servicing after each statement has been specified) and in the
S5-155U (155U mode) by writing the STEP 5 program accordingly. Interrupt
servicing is already disabled in the restart OBs.
The effects of configuring on the cycle time
Because of the increase in the module firmware's cycle time for configuring of a
channel, the STEP 5 program must be written in such a way that the other channel
is in a safe wait state while a configuring FB is executing.
EWA 4NEB 811 6120-02a
8-9
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