Checking Module Operation; Example Configuration Chart - Siemens SIMATIC 505 Installation And Operation Manual

Configuring the Module (continued)
Checking Module
Operation
2-12 Installlation
First, turn on the base supply power. If the module diagnostics detect no
problems, the status indicator on the front of the module will light. If the
status indicator does not light (or goes out during operation), the module
has detected a failure. For information on viewing failed module status,
refer to your SIMATIC TISOFT or SoftShop user manual. To diagnose and
correct a module failure, refer to the next section on troubleshooting.
You must also check that the module is configured in the memory of the
PLC. This is important because the module will appear to be functioning
regardless of whether it is communicating with the PLC. To view the PLC
memory configuration chart listing all slots on the base and the inputs or
outputs associated with each slot, refer to your SIMATIC TISOFT
Programming Manual. An example chart is shown in the Figure 17.
NOTE: If thermocouples are not available for testing, the module will report
ambient temperature by simply jumpering the (Cn+) and (Cn–) terminals
with a short wire 26–18 gauge. This will verify that all channels are
operating and that the module is logged into the PLC.
In this example, the SIMATIC 505–2556 Module is inserted in slot 1 in I/O
base 0. Data for channel 1 appears in word location WX1, data for channel
2 appears in word location WX2, etc. For your particular module, look in the
chart for the number corresponding to the slot occupied by the module. If
word memory locations appear on this line, then the module is registered in
the PLC memory and the module is ready for operation.
Figure 2-7 Example Configuration Chart
SIMATIC 505–2556 Installation and Operation Guide