Rockwell Automation 1771-IS 5V DC INPUT MOD - Manual (Page 6)

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WARNING: Outputs of any output module may temporarily
change operating state at power-up if placed in the same I/O
chassis with a multiplexer module, cat. no. 1771-IS, earlier
than hardware revision D, and a power supply (or processor
with self-contained power supply) other than 1771-P1 or
1771-P2. To avoid damage to equipment and/or injury to
personnel use only multiplexer modules, cat. no. 1771-IS,
hardware revision D or later.
Important: Hardware revision D is designated by part no.
XXXXXX-XX/D on the module nameplate. Earlier modules (cat. no
1771-ISC) do not have this part no./D designation.