Pilz PSS SB TESTER D - Manual (Page 27)

Operating Manual: PSS SB TESTER 5-9
Length measurement
The length measurement can be used to establish the length of bus lines
longer than 25 m.
The Tester measures the runtime of a pulse on the bus line and uses this
to calculate the cable runs. The basis for the calculation is the cable’s
signal runtime.
The ex-works setting for the signal runtime is 4.5 ns/m. This value is valid
for the Pilz standard cable for SafetyBUS p (order no. 311 070). If you use
a cable with a different signal runtime, you will need to amend the set
value. See the “Operation” chapter, section entitled “Commissioning”.
INFORMATION
If the following devices are connected to SafetyBUS p:
• PSS(1) SB CPU up to Version 2.1
• PSS SB 3006 IBS-S up to Version 1.8
• PSS SB 3006 DP-S up to Version 1.5
• PSS SB 3006 CN-A up to Version 1.2
• PSS SB 3056 up to Version 1.8
• PSS SB ROUTER up to Version 1.1
• PSS SB DI8O8 up to Version 1.6
• PSS SB DI16 up to Version 1.4
the measured value will deviate from the actual physical cable runs by 1.5
m per device. However, the measured cable runs correspond to the
effective electrical cable runs on SafetyBUS p, i.e. the cable runs that are
the key factor in selecting the transmission rate.