Analysis PLC firmware ，Noinvalid message output

[youngcraft]

Recently I analysis the PLC(Programmable Logic Controller) firmware ,when i binwalk it ,I found it use cpio command to zip the files. but when i cpio the file ,i get a message "NO"

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cmd$ file 0.cpio

0.cpio: ASCII cpio archive (SVR4 with CRC)

cmd$cpio -i -F 0.cpio

cpio: Malformed number 2C6D
S3
cpio: Malformed number 275B
S3
cpio: memory exhausted

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Then i have not any solver to do it . I use binwalk cpu_rec plugin to recognize the firmware plc 's cpu core .
it show me this 👍
0.cpio full(0x1478ea) Stormy16 chunk(0xd0800;417) Stormy16