Siemens CPU 313C Hardware And Installation Manual page 95

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You can damage the spring-based opening mechanism of the front connector if the
screwdriver slips sideways or if you insert the wrong size of screwdriver. Always
slide a suitable screwdriver vertically into the desired opening until it reaches the
stop. This will ensure that the spring terminal is fully open.
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There is a separate opening for test probes up to 2 mm in diameter to the left of the
opening for the screwdriver.
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The modules (SM, FM, CP 342-2) are mounted on the rail.
S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
A5E00105492-03
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