Contacts on Safety Relay

Question

I'm trying to replace this Banner part (an E-Stop Safety Relay) with a Siemens part that will do the same thing. Originally, I had picked this replacement, but became concerned when looking at the datasheets, because the replacement candidate doesn't have contact ports S11, S12, S21, and S22. Will it still work? What do these port numbers mean; is there a spec somewhere that describes them?

Edit: The input is 4.2 A of 24V DC from this power supply (which is coming from 20 A, three-phase 230V AC power).

Answer 1

Contact numbering follows the format

XY
 Y = 1/2 (normally closed) or 3/4 (normally open).
X = contact number 1, 2, 3, etc.

^{simulate this circuit – Schematic created using CircuitLab}

Figure 1. Six contacts of a fictitious relay with their numbering.

Figure 2. The Banner safety relay terminal numbering.

Neither the Banner or the Siemens parts have contacts 11 - 12 or 21 - 22. I don't see a problem here.

Section 14 of the Siemens SIRIUS 3SK1 user manual shows how to wire the module. There are too many configurations for me to guess the correct one for your application.