S5-115F Manual
Rules Governing the Use of the S5-115F
Variants of the interrupt DI test
•
Short test on restart
The short test on restart checks all interrupt DI bits with signal level ”1” and leaves all bits with
signal level
"0" untested.
•
Supplementary test
All interrupt DI bits which did not report an interrupt in the last cycle are subjected to the
supplementary test. The test cannot be carried out if the interrupt DI signal is not ”1”.
The operating system allows the user to set a ”1” in system data word SD 98 for all interrupt
bits for which the error response to a non-executable supplementary test did
not result in PLC
STOP.
Example:
If you do not want the PLC to respond by stopping in the case of an error at the interrupt
inputs x.0 and x.3, program the following operations in an FB:
L KM 00001001 00000000
T RS 98
The user and the inspector check the relevant interrupt DI bits according to the following
conditions:
- A user test must ensure after system startup that all interrupt DI bits are capable of
functioning.
- It must be proved that more than one interrupt occurs for each interrupt DI bit within the
second error occurrence time (process-dependent).
The basic state of SD 98 is the ”0” word so that the interrupt DI test responds with the usual vigour
to interrupt DI bit status ”0”.
10.10
Digital Output Modules (DQs)
When configuring the I/O modules ( Vol. 2 of the Manual), define the I/O type for each DQ
according to the process output signal characteristics of each DQ module. There are three
different DQ types.
Outputting commands to protective devices
Commands which initiate protection functions, such as emergency off commands, require special
care in programming. For this reason, make sure that these commands are not mistakenly
rescinded in the program.
Make your program structure as simple and clear as possible. This also simplifies the inspector
's
work.
Relay DQ 458-7LB11 (8 bits, 60V/5A)
This module can be used at rated voltages up to 60 V.
DQ address 126
Note
The 115F operating system uses DQ address 126 to detect a permanent enable
resulting from a defective DQ. DQ address 126 must not be used in the user program.
EWA 4NEB 811 6148-02
10-27