Siemens IP-Module Especificaciones Pagina 57

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IP 240 Functional Description
Wirebreak/short-circuit (red WB LED)
When a channel is set to symmetrical pulses, the encoder cable is monitored by evaluating the two
pulse trains of an encoder track. Detection of a wirebreak/short-circuit is indicated separately for
each channel for the duration of the fault condition with the red WB (WireBreak) LED.
Hardware fault (red MF LED)
The red MF (Module Fault) LED indicates a hardware fault on the module. If the LED does not dar-
ken
within 3 s following power-up, the module has a hardware fault and cannot function properly.
6.2 Programming
The user program selects the modes and controls the IP240.
Configuring and control function blocks are available for this purpose; these handle the data
interchange between the S5 CPU and the IP 240 module. The standard function blocks are PLC-
specific. All data to be transferred is managed in a data block which must be created by the user.
Table 6-1. Standard Function Blocks
IP 252
expansion
CountingPosition
decoding
Positioning
Functions
and data blocks
Mode
Configuring function block
Control function block
Data block
FB 173
DB x
x = Number of the data block (3 to 255)
FB 168
DB x
FB 167
FB 170
DB x
FB 169
FB 172
DB x
FB 171
Any errors occurring during execution of an FB are flagged in an error byte as group error and
described in detail in data words.
Note
When using both an IP 240 and a WF 625 with operator panel, the numbers of the
standard function blocks for one of these modules must be changed, as the FBs for
both modules have the same number.
EWA 4NEB 811 6120-02a
6-3
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